volker.halbach wrote:I am going to seal my panel tank with the Slosh tank sealer.
Are you really
sure you want to do that? It seems like an easy fix but might (or might not) cause you serious problems in the future when additives to gasoline change. If pinhole leaks have developed then likely the metal is too thin so more serious measures are called for. If it develops further leaks after the coating has been applied then your options for dealing with those leaks is limited because will make, say, soldering very difficult indeed.
A decade ago MTBE was the principle substance added to gasoline to increase its octane, which was then replaced by ethanol. Other chemicals come and go for different reasons and if one of them attacks the coating in the future you will have a real mess on your hands because you won't be able to remove it. Some of those tank sealers say they form a polyurethane layer. If you look up the chemical compatibility you'll find it is 'resistant' to gasoline but only 'conditionally resistant' to ethanol.
I suspect/fear this will turn into an "oil thread" where lots of opinions are expressed. So, having had my say, I'll say no more.
p.s. as a safe rust remover I use molasses/treacle. It is slow acting (i.e. taking days, not minutes or hours), especially if it is cold, but removes rust without attacking the steel.