Re: How do I clean out my gas tank?
I used ther POR15 sealer on ours back in 03/04. so far so good. when I poured it out, I brushed that on the outside of the tank too, color looks like galvanized, but shiny, figured that would seal up the seams so it couldnt rust back up under the sealer from the outside.
Figured why not, as POR cant be saved once exposed to air, it will solidify in the can with any humidity exposure, o dont open the can till ready to use it.
POR is also odd that while it dont look thinner than other paints, it creeps everywhere, as if it were alcohol thin...get a drop on your shirt, you'll have a 6" spot on your skin that takes a month to wear off- it is THE messiest material Ive ever worked with, as you pretty much cant clean it up- I put a big old tarp down for the tank, as it dripped out the holes and off the outside for a while before it set. had it set on the flanges up on sawhorses angled to drain...take the time to arrange a 'drain position' stand to flop it up on before untaping the holes, but expect some sealer leaks, and a big mess...
POR recommended phosphoric acid etch(they call theirs 'marine clean' IIRC) before final rinsing and coating. dont think anything STOPS existing rust faster than a phosphoric acid etch, and dont think theres many sealers that adhere as well as POR stuff over rusted/etched metal. just dont think of putting it over paint, it wont bite at all...on etched steel you need a grinder to remove it.