http://www.tcpglobal.com/autobodydepot/trunkfinish.aspx It may be this stuff. I inquired to the manufacturer about the composition. They say it's water based with solvent based spatter. They say it needs no clear coat. And I agree, over epoxy primer sealer with or without a coat of paint, it should be fine. But not on bare or ordinary primed steel.
Vikki 1969 Goldenrod Yellow / black 400 convertible numbers matching