I posted this one a while back but it fit this thread so I will post it again.
Just as an experiment I tried using a Minwax Spar Exterior polyurethane clear coat out of a spray can that I had purchased at Home Depot on my gas tank and side covers.
I know it is supposed to be used as a finish on wood but I tried it anyway.
I applied it over a base coat of blue metal flake Dupli-color Lacquer that I had applied a couple of months earlier.
Even with buffing and polishing the lacquer was quite dull and never looked very good.
The results were Quite spectacular and the finish came out very glossy and deep looking. As an added bonus its gas proof.
Currently the finish is 8 months old and I have had a couple of spots bubble in the clearcoat where I did not clean and prepare the lacquer underneath good enough. Truthfully I did next to nothing to prepare the lacquer except wash it. If I were to do it again I would clean it with mineral spirits to remove the old wax.
When I was spraying on the the polyurethane it would not go on evenly, it ran and puddled badly.
Frustrated I went up to the Home Depot to get some solvent to remove it. When I came back much to my surprise it had smoothed and leveled itself out and hardened nicely.
With the appropriate preparation I think this could work out very nicely.
Before Clear Coat

After Clear Coat
