I have once. They say 2 parts epoxy 1 part resin. the amounts should be on the directions. Once you spread it out, you are suppose to use a torch to get the bubbles out. This is where I made my mistake. Don't get the torch to close to the epoxy or leave torch in one spot to long. I use this on my reloading bench. The scorched epoxy never hardened and remained tacky in the spots I got to close with the torch. I ended up taking the top off and varnishing a new one.
