TotalBoat Underwater Repair Epoxy Two-Part Putty 2-Gallon Kit

Underwater Repair Epoxy


This versatile 2-part epoxy repair putty fills voids, patches holes, and seals leaks on aluminum, fiberglass, wood, steel, and even concrete for impact- and abrasion-resistant repairs. It cures completely (even underwater) in just 6 to 8 hours at 70°F. A must-have for any boat's emergency toolkit.

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Product Description

  • Two-part epoxy patching and repair putty creates permanent bonds on fiberglass, aluminum, steel, wood, and concrete surfaces at, above, and below the waterline
  • Easy to mix, use, and apply in an emergency—in or out of the water
  • Thick formula won’t sag on vertical or overhead surfaces
  • Cures completely in 6 hours at 70°F in air or in salt or fresh water—even underway
  • Cures to a rock-solid, hard surface that stops leaks and resists impacts and abrasion
  • Once cured, can be drilled, machined, or tapped
  • Prevents wood from deteriorating and weakening; prevents corrosion from forming on metals
  • Non-shrinking, non-sagging putty is great for reliable, permanent repairs on boat hulls, docks, and much more
  • Size: Available in a 2-Pint Kit, 2-Quart Kit, or 2-Gallon Kit. Each kit contains equal parts Part A resin and Part B hardener, and includes 1 pair of large, powder-free latex gloves.
  • NOTES: TotalBoat Underwater Epoxy Putty is not for use in potable water systems. Cured putty is not suitable for sanding.

Make emergency repairs without hauling out

Discovering your floor hatches floating to the tune of your shrieking high-water alarm can wreck a relaxing trip in a heartbeat. When bad things happen on a boat, they can happen really fast, requiring immediate action to reverse the situation, or at least keep it at bay. The more time you spend on your boat, the greater the chances are that some day you’ll be faced with a disaster that threatens your boat’s ability to stay afloat.

Prepare yourself with an emergency toolkit that includes TotalBoat Underwater Repair Epoxy. It lets you make repairs without hauling out first because it can be applied underwater to patch, fill, and seal leaks in aluminum, fiberglass, wood, and steel hulls.

Mix it, apply it, and cure it underwater—even underway

When we say underwater, we mean underwater—for mixing the two components, applying the putty, and letting it cure. Of course, it works just as well in air above the waterline, too. Either way, it’s easy to mix—just wet your gloved hands, grab equal-sized chunks of Part A and Part B, and combine thoroughly. Mix as much as you think you’ll be able to use in 30 minutes. Keep the putty wet while mixing it. This isn’t hard to do if you’re underwater, but if you’re working with it out of water, the second you feel it sticking to your gloves while mixing, wet your gloves and keep mixing. The putty is ready to use when it becomes a consistent, dark green color.

In an emergency, our Underwater Epoxy Putty gives you a generous working time of up to 30 minutes at 70°F, which gives you enough time to slap it on the repair area, smooth it out, mix more, apply, and smooth, to build up a thickness of 1/8" to 1/4". It’ll begin firming up in about 2 hours at 70°F, and is super-sticky enough to stay where you stick it, and will cure properly, even while your boat is moving through the water returning to a safe harbor.

Rock-hard, reliable repairs on everything from boat hulls to pier supports—and much more

This versatile epoxy repair putty cures completely hard in 6 hours at 70°F—in air or underwater. It creates a high-strength, extremely hard surface that protects against impacts and abrasion, making it ideal for repairs to hulls, docks, pilings, sea walls, buoys, concrete barriers, and many other wood, steel, aluminum, fiberglass, and concrete structures. While it’s protecting repaired surfaces from impact damage and water intrusion, it’s also preventing new corrosion on metals and further deterioration on concrete and wood.

More TotalBoat products for your emergency toolkit

TotalBoat Underwater Repair Epoxy plugs leaks, patches holes, and reshapes surfaces to rebuild them, and it comes in three convenient sizes to tackle large and small repair jobs. Don’t leave the dock without it. Other indispensable TotalBoat products for your emergency toolkit should include TotalBoat FlexEpox flexible epoxy adhesive and TotalBoat TotalFair epoxy fairing compound.

FlexEpox creates permanent structural bonds that bend without breaking for quick and easy gluing repairs on fiberglass, metal, plastic, and wood. It has an easy-to-use 1:1 mix ratio, works on wet or damp surfaces, and also cures underwater, making it ideal for hull repairs.

TotalFair is a two-part epoxy fairing compound with a simple 1:1 mix ratio that’s easy to measure, mix, and apply to clean, dry surfaces. Use it to fill voids, and fair, shape, or repair dings and dents in fiberglass, aluminum, steel, and wood surfaces. It dries quickly, and can be sanded in just three hours at 80°F.

All three of these dependable, durable epoxy-based products can be used above and below the waterline, provide excellent moisture resistance, and should be kept on board in case of emergencies.


  • Components: Two
  • Mix ratio: 1 to 1
  • Mixing: Use gloved hands or a putty knife
  • Color (admixed): Dark green
  • Application: Using gloved hands, apply to repair area; use heavy hand pressure to remove air bubbles
  • Application temperature: Above 50°F; (will not adhere and cure properly at temperatures below 50°F)
  • Application thickness: About 1/8" to 1/4"
  • Working time: 30 minutes @ 70°F
  • Firm time @ 70°F: Approximately 2 hours
  • Full hardness time @ 70°F: Approximately 6-8 hours
  • Important: Always wait for full cure before machining, drilling, or tapping TotalBoat Underwater Epoxy Putty.

TotalBoat Underwater Repair Epoxy Technical Data
Underwater Repair Epoxy Part A Resin SDS
Underwater Repair Epoxy Part B Hardener SDS

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