The best stuff for what?

 

Fluid film is a great product with lots of good reviews.

 

Undercarriage coating and rust coverup

 

I bought a new gas tank and sprayed the whole thing (bare metal) in duplicolor undercoat. However, I can scratch it off with a fingernail very easily. I didn't think that I needed to prime beforehand but now I am wondering.

 

a primer prolly would have helped. im no paint expert tho. how long did you wait for it to dry before you touched it?

 

Hour or two.

 

it will toughen up a bit. mine took a while to cure good