Gas tank cleaning

Any of you folks that have failures, use a fuel tank coating or anything after you cleaned it ?
There are several avail for different tanks.
Including some for aircraft .

8 fl oz is enough to coat the inside of a 6 gallon fuel tank. 32 fl oz (quart) is enough to coat the inside of a 25 gallon fuel tank. Formerly U.S. Standard Fuel Tank Sealer. - POR-15 Fuel Tank Sealer Technical Data Sheet.