Removing Bubbles in Epoxy in Beginner's Corner Posted January 2, 2017 · Report reply Have you tried gently heating the epoxy (is it the resin or the hardener that has the bubbles, I glossed over that in the original post)? I start with hot tap water and drop the bottle in. If that doesn't help, I bring water up to boiling and take it off and then drop the epoxy bottle in. Some sloooow rolling of the bottle while the epoxy is warm may help. You are trying to reduce the viscosity of the material so the bubbles rise to the surface. The laying out the epoxy on aluminum foil and using a slight heat source below it will also help (as long as the heat source is not hot enough to form bubbles). spreading the epoxy out reduces the distance a bubble has to rise before it pops. Thinning the epoxy also helps, but it completely changes the character of the epoxy when it goes on. Good luck.