I have heard of people (soldering) milk jug plastic and fixing tanks,,,look around your house if its a big tank get a 50 cent bottle of rubbing alcohol and make a tank out of it,,,shampoo,,heck I have made 1/2A (.049) tanks from visine bottles, cutex nail polish remover bottles even bubble blowing bottles.....but please dont waste your time trying to fix a plastic tank,,think about it, if it doenst work you wont know until your plane is ruined...Rog