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Is epoxy really waterproof?

April 26, 2017Epoxy waterproof

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Is epoxy really waterproof?

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Most 5, 15, or 30 minute epoxies are not truly waterproof. You can use them inside a boat, to mix with the ballast, for example. This stays dry or, if it gets wet, it will dry out in storage. If you check the inside of the boat for moisture, and leave the roof of the cabin off for a couple of days so any hidden dampness can dry, it should last a long time. If you leave water in your boat, and don’t allow it to try after use, the epoxy will become rubbery and gooey in a couple of years. If you keep it dry, it can last years longer. Never use epoxy for a bond that is continuously immersed in water. Use epoxy resins that have a 60 minute or longer cure. All products can vary. The tiny amount of epoxy that is at the hole where the stern tube exits the hull is usually sealed with paint so it should not suffer any deterioration.