Hello there, my names Hal, and im a school student who has just finished his tech project of making a speargun, ive made the trigger mech and gun and all, and it works. Only thing left to do is put a finish on the gun, its made from teak, and ive seen stuff on here about coating it in epoxy, which i don't understand? I live in New Zealand so i probably wont have access to a lot of products that you guys may recommend, but will tung oil do the trick? or if you have a better idea, please elaborate