This not how you want to mount that tank if you are interested in a 20 year solution. Attach neoprene strips to the tank with 3M4000 wherever the tank comes into contact with anything! Water trapped against the tank will lead to crevice corrosion and premature failure. Aluminum banding isn't that strong. Use glassed over wood notched to the tank and screwed into the stringers. Buffer under it with neoprene strips.
I did my tanks last summer. Checkout the project.
Decided that this is the year to replace my 25 yo fuel tanks. No leaks. I plan to keep the boat. I'll document the process here. Pulled the hatch. This hatch was rebuilt a few years ago with Coosa board. Looks good and feels solid. Hatch was set with 3M 4000 - kept everything sealed. Some...
www.greatgrady.com