I spilled gas on the tank and the finish "wrinkled"
It looked kind of "flaky" or "crinkled" in spots
So -- I sanded down those spots (to the metal)and sprayed on some enamel
Now you can see the boundries where the old finish (which I also sprayed over)
ends and the enamel begins.
Looks like craters on the surface of the moon
Is this whyyou "wet" sand?
To eliminate these "border" areas?
Should I sand down to the metal again or just "wet" sand to eliminate these
and re-spray?
Or - should I use some kind of liquid stripping material instead?

 

It depends on how important your finish is to you. None of us like a crappy paint job, so I'd probably take it down to the metal and start over. If you use a liquid stripper, just make sure to wipe it down (afterwards) with alcohol or some type of paint prep. If you dry/wet sand, (will take much longer,) as someone else posted previously, just make sure the "final" texture is a smooth as possible. I'd recommend using steel wool as the final abrasive; maybe a 0000 grade.
Paint is 95% preparation and 5% paint job; don't expect paint to cover-up sanding grooves or swirls. Yes; it's a b^#$@, but the work is worth it when it's done.
Use a pro-quality clearcoat over the finished product, and of course, keep theenvironment as dust-free as absolutely possible, if you don't have a paint booth. Don't rush it.

 

hahaha, you need to feather the layers first. Wet sanding alone will not solve your situation.As mentioned, prep work takes the most time. Have fun.

 

1+

I have done a little automotive body work years ago and hated it. But, stripping down, and redoing your tank is about the only way to fix it.

I'm quite surprised some gas made your paint bubble though. I am guessing you must of had a crack in the paint or something that the gas was able to seep through.

 

if a little bit of gas ruined your clear coat.. do not let them paint your tank again.. re do the whole tank somewhere else...