By now, mot of us have read about the issues using foam to seal and cushion marine tanks. Sooner or later it invites corrosion. I have been working on my 1986 Sea Ray Amberjack restoration for almost 4 years. Covid and health issues have cause many delays. I am ready to install gas tanks. SR I/Os are notoriously rear-end heavy. 1987 SR got smarter and relocated tanks further towards bow and along gunnel. I am relocating (2) 50 gal tanks each (20"x 19"x 47") under captain and mate bunks. Unfortunately, I only have a 2' height x 3' depth x 5' length working area to play in, which is tight for my 250 lbs, and although the places where I will lay tanks is relative flat, it was not perfect. It had curves. Tanks would roll a bit. I had to build up thickness surface on tanks or boat surfaces to make sure tanks laid as flat as possible. I chose tanks. I had just enough room between tanks and the boat's planned mounting surfaces to apply epoxy resins ( with fumed silica) and lay tanks on resins to conform and make a good mating surface to boat. Releasing wax worked great. But, my building tank surfaces is not perfect. I plan on cutting and pasting 2" x 47" x 1/4" neoprene strips onto tanks or boat surface to act to fill in resin imperfections and cushion tanks. Any suggestions would be appreciated. Thx