One quick observation. Be careful when pour-treating the inner part of the tank with epoxy. We receive an increasing number of tanks for repair that are epoxy pour-treated and damaged beyond repair after time. Please take my advice and give it to someone experienced. Preparation is the most important thing! There is in fact no liquid able to etch or clean the inside of the tank. In most cases, there is no other way but take the tank to pieces, burn and brush it and re-compose it again. Or at least we cannot do it otherwise.