Hi OregonSpearo,
To dilute the epoxy I used a chemical substance whose English name I don't know. Here it is called AMB, I don’t know if the acronym rings any bells for you. Initially I planned to use only epoxy, but later I changed my mind after watching a demo video of the Totemsub spearguns (
www.totemsub.it). The guy who produces them said he uses first 3 layers of epoxy to impregnate the wood and then varnishes it with 2 or 3 layers of polyurethane for that shiny look.
Yesterday I tried the gun in the water for the first time. I was really surprised how well balanced it was and this is by pure chance :-) I did not put any ballast in it at all. When it is loaded with the spear it can be hold with two fingers underwater and it stays perfectly horizontal. It is lighter underwater and tracks better than my friend’s Cressi Comanche 90. Without the spear it floats and also stays horizontally on the surface. Unfortunately I didn’t have the chance to meet any fishes and introduce the gun to its real purpose because it is still very cold here and the fishes are hidden in the depths. However I’m very happy that the gun performs well.