I don't know about "fish oil" but the rustoleum and krylon aren't even compatible with themselves anymore. Forget doing a multi-colored paint scheme with overlapping colors...they'll crinkle where you spray over it's own previously cured paint (it didn't do this three years ago). I know this from the r/c sailboat model building I did last year.

It does, however, lay down much smoother than before and you can get a pretty impressive result out of a can (durable enough for an r/c sailboat that lives mostly indoors)...you just can't layer colors.