Best Boat Epoxy | LakeWizard

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Making or fixing boats requires different materials. One of the essential items you need in such work is a good boat epoxy.

But, how can you determine the best boat epoxy to get? Are there features you must check to identify the correct epoxy to use?

When you want to build or fix a boat, the best epoxies are Brampton Marine Epoxy for Boat Repair, J-B Weld 8272 MarineWeld Marine Epoxy, and AQUASEAL Multi-Use Marine Epoxy. These have high tensile strength and are marine grade. You can use the epoxies to create strong and durable bonds.

Having boat epoxy around is as essential as building or fixing the vessel as many other tools. The epoxy helps bond two parts together or repair cracks on the boat. Ideally, the right epoxy will form and maintain the bond even underwater.

Always check for features such as UV resistance. Also, the epoxy must have the ability to retain structure even with chemical and solvent exposure. Epoxy is necessary and must be functional in fresh and saltwater without compromising its structure.

Table of contents


10 Best Boat Epoxy

Your boat needs high-quality epoxy to ensure quality fixes that are waterproof. Such products guarantee long-lasting qualities because they resist natural and weather conditions.

So, check the properties of epoxy before buying to ensure you get the best quality possible. We have prepared the review to help make your decision simpler.

1. Brampton Marine Epoxy for Boat Repair

Brampton Marine Epoxy for Boat Repair
Brampton Marine Epoxy for Boat Repair

At times you want an epoxy that you can use underwater. The Brampton Marine Epoxy is a product that suits underwater boat repairs. It’s different from usual epoxies in that it has excellent waterproof technology.

The best use of the boat epoxy is forming and maintaining bonds that won’t come apart because of the moisture around. These bonds remain intact whether the boat sails in salty or freshwaters. The epoxy is compatible with metal, plastic, galvanized steel, and fiberglass materials.

As a strong boat epoxy, this is resistant to chemicals like solvents and petroleum. Since this is a weather-resistant adhesive, the marine-grade epoxy suits all outdoor use. You can do all sorts of outdoor repairs without worrying about the quality of the bond.

Unlike superglues, the boat epoxy holds its own when exposed to heat, extreme cold, humidity, or other extremities. Start by setting the bond, which takes 15 minutes to complete. Next is curing, which takes 30 minutes at room temperature.

The marine-grade adhesive comes in 2 four-ounce easy to squeeze bottles. The sharp nozzle enables quick dispensing even in tight spaces that need repair. There’s no need to have any tools when working with the epoxy. Simply apply, and wait for curing before making any adjustments to the area.

2. J-B Weld 8272 MarineWeld Marine Epoxy

J-B Weld 8272 MarineWeld Marine Epoxy
J-B Weld 8272 MarineWeld Marine Epoxy

The J-B 8272 MarineWeld Marine Epoxy is among the most versatile and dependable epoxy. It works on numerous materials meaning there’s no need to get a different one. The epoxy works well on metal, fiberglass, plastic, and other materials.

It comes in a neat tube that’s easy to squeeze when working, even on small crevices as a boat epoxy. It’s a 2-part weld system ideal for strong and lasting repairs on different surfaces. It’s what you need when there’s an urgent DIY repair on the boat.

Start by mixing the content of the two tubes on a ratio of 1:1. After that, apply the epoxy and wait for 4 to 6 hours. This is how long it takes the boat epoxy to set properly. Curing takes longer, lasting up to 24 hours, after which you can begin working on the surface.

Once cured, the boat epoxy is suitable for tapping, filing, sanding, molding, and drilling. It’s a steel-reinforced adhesive with a 5020 PSI tensile strength. It can also ensure 550°F and below heat without affecting the bond.

After curing, many chemicals, solvents, and petroleum have little to no effect on the adhesive. It’s waterproof and perfect for all surface applications on varying materials. Follow the instructions on the package for the best results.

3. AQUASEAL Multi-Use Marine Epoxy

AQUASEAL Multi-Use Marine Epoxy
AQUASEAL Multi-Use Marine Epoxy

A combination of resin and hardener makes working on a project simpler. A good example is the AQUASEAL Multi-Use Marine Epoxy. This resin and hardener kit provides durable results by creating lasting results when building or repairing boats.

There’s everything required to create strong bonds, such as half a gallon of resin, a half-gallon hardener, 2 measuring cups, 2 plastic spreaders, and 2 plastic stirrers. The combination is simple and comes with clear instructions for dependable results.

Start by mixing 1-part resin with 1-part hardener. Use the measuring cups for each clear solution, stir and start spreading the combination. It’s suitable for wood, fiberglass, steel, aluminum, and many more materials.

The marine epoxy has a fast curing rate creating a strong, clear bond. It’s UV resistant and makes the ideal repair epoxy for boats. Always use the resin and hardener when at 77°F. If not, then warm the bottles before you start to mix.

Store the remaining resin and hardener at room temperature for future use. Note that following the given instruction is crucial when using these clear solutions.

4. PC- Products PC-11 Epoxy Adhesive Paste

PC- Products PC-11 Epoxy Adhesive Paste
PC- Products PC-11 Epoxy Adhesive Paste

Doing repairs on boats requires adhesive that can withstand lots of tests. Such is the PC-Products PC-11 Epoxy Adhesive Paste. It’s ideal for emergency boat repairs to prevent further damage that can impact a trip.

The marine-grade epoxy comes in a 2-part paste for use in multiple environments. As much as it works underwater, it’s also an ideal adhesive for dry and wet parts of the vessel. Use it to bond materials such as glass, rubber, ceramic, fiberglass, metal, and concrete.

The application works both indoors and outside when the temperature is anywhere between 35 to 115 °F. Its versatility makes it ideal for overhead and vertical application during all repairs. The paste is resistant to gasoline, mild acid, salt water, fresh water, and even caustics.

The application of the adhesive paste begins with preparing the surface. Mix the two pastes in a ratio of 1:1, then apply and cure the adhesive. Instructions are clear on each can and must be followed for the right way to mix, apply and cure the paste.

5. 3M TALC Marine Adhesive Sealant

3M TALC Marine Adhesive Sealant
3M TALC Marine Adhesive Sealant

Permanent bonding and sealing are crucial when working on boats. This is why boat epoxies like the 3M TALC Marine Adhesive Sealant must be part of your repair kit. This easy-to-apply sealant works to bond and seals any faults on the boat fast.

The good news is this is a one-part adhesive that you can apply easily on your boat. While other epoxies come in two tubes that you have to mix, this sealant is ready for use. The small tube is designed with a snout that fits even into the tiniest cracks that need sealing.

It takes about 7 days for the sealant to cure. Only then can you start working on this section of the boat. The sealant keeps the bond strong even when you sand, drill, or perform any other activity. It’s an extremely strong adhesive that’s ideal for wet surfaces and underwater use.

The formula for the string adhesive remains intact even with exposure to fresh or saltwater. The tough bond is flexible and not prone to issues even when there’s vibration. After curing, not even structural changes, shock, shrinking, or swelling will affect the bond.

6. STARBRITE Silicone Sealant

STARBRITE Silicone Sealant
STARBRITE Silicone Sealant

The STARBRITE Silicone Sealant is a 100% marine-grade silicone that any boat owner must-have. This sealant forms strong and reliable bonds on the boat when needed for repair. The best part is using this silicone sealant above or below the waterline.

The sealant’s formula ensures the bonds formed are strong and permanent. It’s ideal to use on metal, some forms of plastic, glass, wood, and fiberglass. Therefore, take note of the material you want to bond before using this silicone boat epoxy.

It’s a strong adhesive that provides waterproof and airtight bonds during boat repairs. However, as strong as the bonds are, you can remove them with ease when you need to do so. The sealant is ideal for mounting some deck hardware on the boat.

Even with outward use, the sealant remains intact even with harsh UV exposure. It’s resistant to numerous chemicals and solvents as well. There’s no need to use tack with this boat epoxy that takes an hour to bond.

Complete curing will take up to 24 hours, after which you can begin working on the area. You can get some custom colors to match the area you want to create the bond.

7. WEST SYSTEM 105A Epoxy Resin

WEST SYSTEM 105A Epoxy Resin
WEST SYSTEM 105A Epoxy Resin

One of the best epoxies in terms of versatility is the WEST SYSTEM 105A Epoxy Resin. It comes in the form of a pale yellow clear liquid with low viscosity. The epoxy works well when you have a wooden boat or a vessel with many wood parts.

It consists of a resin and hardener mixed in the correct ratio to form strong bonds after use. The epoxy has a high-strength curing capacity creating a waterproof area. It’s also highly resistant to water vapor effects.

You can create high-strength joints, pigmented coating, low friction surface, and fairing compounds using epoxy. It’s possible to modify the epoxy to meet the needs of the task at hand. The epoxy consists of resin and hardener in the ratio of 5:1, and it is best to store it at room temperature.

While epoxy is ideal for wood, it also works on fiberglass surfaces. It gives both surfaces an excellent finish and is UV resistant. The bond won’t shrink or change color even with prolonged sun exposure out in the water. It’s an ideal coating and lamination finish for such surfaces giving a glossy and attractive look.

8. TotalBoat Floatation Foam

TotalBoat Floatation Foam
TotalBoat Floatation Foam

When it comes to epoxy adhesive, there are different types of resin that you can get. For the TotalBoat Floatation Foam, the manufacturer uses polyurethane resin and an activator. To form the epoxy, you have to mix the two materials that come in separate cans.

While most epoxies come in liquid and paste, this kind comes as foam. It’s lightweight and works well to fill gaps or offer insulation on a boat. The foam is ideal for non-structural work and meets the set standards by the US Coast Guard #33 CFR 183. 114.

All you need to do is mix the resin and activator foam in a ratio of 1:1. After application, you notice it begins rapid expansion while hardening. The process takes a total of 5 minutes at room temperature. You can use it to build multiple layers that you want to file under the deck of a boat.

The epoxy is good for marine application since it’s a 94% closed-cell foam. The bond that forms after hardening is water-resistant and won’t come apart due to solvents or gasoline exposure. Shaping or curving runs smoother as well.

Ensure you vent the area as you mix for proper hardening and curing. However, expansion can decrease if temperatures drop below 75°F. Ensure you clean the surface before working on it because of the rapid expansion.

9. Seal Bond Marine/Industrial Adhesive

Seal Bond Marine/Industrial Adhesive
Seal Bond Marine/Industrial Adhesive

Strong adhesives come in colors like the black Seal Bond Marine/Industrial Adhesive. The epoxy has a tensile strength of 450 PSI and is a high-performance marine adhesive. The best use of this epoxy is on boats above the waterline for effective formation.

The epoxy performance is broad while maintaining water and UV resistance. It’s an all-weather sealant that retains its form even when temperatures rise and fall rapidly. In addition, this is a non-flammable epoxy safe to use for marine surfaces like on boats.

There’s no mixing when you get this adhesive. All you need is to unscrew the top to access the paste inside the long tube. Application is through a sharp nozzle, and it takes the adhesive 7 days to cure. All the while, the bond is 100% shrink-proof and remains flexible.

Most applications involving this marine adhesive don’t require a primer. It works on numerous materials such as metal, aluminum, glass, wood, Styrofoam, plastics, ceramics, and even steel. The adhesive sets fast in all these, so it’s better to do surface preparation before the application begins.

10. Sikaflex-291 Fast Cure Marine Adhesive

Sikaflex-291 Fast Cure Marine Adhesive
Sikaflex-291 Fast Cure Marine Adhesive

Having an all-purpose marine-grade adhesive around is essential for repairs. You can get the Sikaflex-291 Fast Cure Marine Adhesive that comes in a tube. The resin and hardener are mixed, so you won’t need to take time to mix the ingredients.

The white epoxy is essential when you want to build or repair a boat. This is because it has a fast setting and curing time that holds joints together. On top of that, this epoxy is water-resistant, making it ideal for above and underwater use.

Use the adhesive on wood, glass, fiberglass, and metal. The durability of the bonds is strong since the epoxy is resistant to fresh and saltwater. You won’t need to redo the work because chemicals, solvents, or gasoline are getting on the epoxy.

The best way to use the epoxy is by squeezing it into the section in need of repair or bonding. The other way is to place some on a brush and apply the paste to the surface. It forms excellent bonds and is for multi-purpose use.

What is Boat Epoxy?

When doing repairs on a boat, there are areas where you have to attach two parts or fix some cracks. On dry land, there are numerous adhesives that you can use to create permanent bonds. However, on a boat that goes on the water most of the time, you have to get a better bonding agent.

The best sealant or bonding agent you can purchase for such work is a boat epoxy. It’s usually a marine-grade sealant that creates strong bonds. The good news is a boat epoxy’s bond won’t come off above or under the water.

Usually, manufacturers mix the resin and a hardener to form the boat epoxy. Some mix and sell you one product while others provide the two. There are instructions on mixing the resin and hardener to create the bonding agent you need to use on the boat.

The waterproof nature of the bonds formed means you can go about your day without much worry. It’s essential to have some boat epoxy when repairing your boat.

Types of Epoxies

When figuring out the right boat epoxy to get, it’s essential to note the different types. Usually, the categorization is based on how much resin is in the epoxy formula.

So, always take note of the resin percentage on the gallon, tube, or tin of boat epoxy.

Coating Resin

Based on the name of this resin, you can figure out how it works. The coating resin works best when you coat it on the boat’s surface. Its texture is thicker, which is excellent for the marine sealant to endure water exposure.

An advantage of the coating resin is you have a faster curing time. It comes in handy when the repair takes place in the open waters. All you need is to mix the resin and hardener. If the boat epoxy is ready to use, coat it on the surface of your boat.

The resin suits different materials and creates strong permanent bonds. It’s better to apply it fast if you want to create the bond and be on your way.

Casting Resin

When you get this resin, you can use it to cast molds. Unlike most other boat epoxies, the casting resin is thinner. This consistency is what you need to create better molds on your boat. When using the resin, you must consider the ratio you want to mix.

Different mixing ratios create different molds as you perform boat repairs. Therefore, it’s better to take time to mix the resin and hardener for the perfect results. Consider the material you are working with to determine the right ratio to create lasting bonds.

Casting resin is ideal for sealing cracks or enclosing gaps on the boat. Always follow the instructions given with mixing the resin and hardener.

Polyurethane Resin

The polyurethane resin is a form of synthetic boat epoxy that’s quite versatile. One of the most impressive features of the resin is its flexibility. This means you can easily modify the boat epoxy to form other materials that you need.

When you purchase the resin, it comes in liquid form, and you have to pour it into molds. The act of pouring helps the resin take different shapes. It’s the most ideal when you want to do some customization work using some additives or fillers.

Marine Grade Epoxy

The marine-grade epoxy is ideal when working on boats. It has many excellent features that make it the epoxy of choice. The epoxy is UV resistant, meaning you won’t experience color change due to extensive sun exposure.

In addition, this is a waterproof boat epoxy suitable for above and underwater use. It creates lasting bonds that won’t come off even with extensive water exposure. Therefore, this boat epoxy is best for repairs on parts of the boat that get wet.

You can use it even in emergencies to form fast bonds. However, curing can take longer depending on the guidance of each manufacturer.

Marine Epoxy Paint

When you want to keep your boat looking lovely, a good coat of paint gives it a facelift. However, because boats are always on the water, you can’t use ordinary paint. Instead, you have to purchase marine epoxy paint.

The paint is easy to use and is only for exterior application on the boat. It dries faster and won’t come off even with constant moisture exposure. Also, the paint remains the same color even with harsh UV exposure.

The application requires preparing the surface first before taking any other step. Read the instructions on the can and follow them for the best results.

Benefits of Using Boat Epoxies

Creating Strong and Lasting Bonds

The best benefit of using a boat epoxy is creating strong and lasting bonds. This boat epoxy forms waterproof bonds, meaning it’s the best for boats.

You can use the epoxy when working above or underwater to fix an issue on the boat.

Little to No Shrinkage

Shrinkage is an issue you’ll face when working with adhesive on boats. Because of the constant water exposure, using any other epoxy can cause shrinkage. However, you only experience a little or no shrinkage when using marine-grade epoxy.

This is essential since shrinkage can affect the strength of the bond. If the bond weakens, you haven’t really solved the issue when repairing the boat.

Bonds Numerous Types of Materials

A boat has numerous parts made from various types of materials. This is why you need an adhesive that can form bonds for any of them. The good news is that the formulation of boat epoxy makes it possible to bond with numerous materials.

The materials you can work with include metal, fiberglass, plastic, wood, and many more. This versatility is thanks to the resin and hardener, which make up the boat's epoxy.

Resistant to Change Due to UV Exposure

When working with different surfaces, some parts won’t be underwater. Boats are often left out in the open and ensure lots of UV exposure. Some epoxies tend to turn yellow when they get lots of UV exposure. But, the boat epoxy remains the same no matter how long the boat is in the sun.

Long Shelf Life

It’s not uncommon to use a small amount of boat epoxy and leave the rest to use later. One positive is that the marine-grade epoxy has a long shelf life. This means you won’t have to keep going to the store to get more epoxy each time you want to work on your boat.

Factors to Consider before Purchasing Boat Epoxy

Buying some boat epoxy can save you a lot of hustle when doing repairs. It's better to get a strong adhesive for boats that get water or are on the water. But, before you choose the right adhesive to buy, consider the following factors:


The best epoxy needs to be durable. You have to get an adhesive that won’t come apart because of continuous water exposure. Check the epoxy and pick the one that stays strong above and below water.

At times the area that you have to fix it on is an area that’s relatively dry on the boat. That’s easier to keep intact. However, the bond formed must last when the area with an issue is underwater. No one wants to come back to fix the same issues several times.


How strong a bond can the adhesive form? The purpose of the epoxy is to bond two parts together or repair a crack on the boat.

If the bond’s strength is weak, issues like shrinkage can cause the bond to come apart. But if the epoxy you use forms strong bonds, the expansion and shrinkage are kept at a minimum. The good news is most marine-grade epoxies form strong bonds.

Liquid or Paste

A marine-grade epoxy can come in liquid and paste form. A good example is the epoxies listed in this guide. These are in paste or liquid form, but they serve the same purpose.

Perhaps the main difference is some epoxies, especially paste, come ready to use. The manufacturer mixes the hardener and resin and then places them in a tube. You have to open the tube and start making repairs on your boat.

As for liquid epoxy, you have one resin bottle and another hardener. There are instructions on how to mix them in the ratio of 1:1. Both liquid and paste epoxies are good. So, all you have to consider is whether you want the work of mixing or not.

Curing Time

Epoxies need time to create the bond. This usually happens after applying the liquid or paste to the area you’re working on. After that, you have to wait for the bond to cure.

Curing varies in terms of duration. It all depends on the formulation the manufacturer uses. Some epoxies take a day (24 hours) to cure, while others have to wait 7 days.

Curing is necessary if you want to work on this specific area after repair. When the time elapses, you can sand, drill or polish the area as you desire. So, consider how long you want to wait before you start the next step and whether the area is large or not.


The viscosity or thickness of epoxies varies; some are quite thick and come in tins. Others are too thin and come in bottles. In between is the smoother paste that comes in tubes. The thickness matters because it dictates the application and curing duration.

Thicker epoxies take longer from the time you start to apply. After that, you have to wait even longer for the sealant to dry. Only then can you do other processes in this area. As for thinner epoxies, the application and curing time is less.

However, note that the thicker epoxy is superior in terms of the strength of the bond. This is because thinner ones tend to create weaker bonds.


How much are you willing to spend on epoxy for your boat? Having a budget in mind helps you when picking out the right adhesive. Most are affordable, but prime ones can be a bit expensive. So, keep in mind how much you want to spend as you choose the right epoxy.

Fresh and Salty Water Resistance

The best epoxy is resistant to fresh and saltwater absorption. The absorption is likely to occur when the bond is underwater or in an area of the boat that gets wet easily. When the bond absorbs water, the moisture can affect the mechanical and chemical characteristics of the adhesive.

So, be sure to check the description of the epoxy to see any disclaimers. Pick a moisture-resistant adhesive if you intend to get on the water, whether fresh or salty. The bond maintains its tensile strength and won’t compromise your repairs or bonds.