I used the duplicolor trunk spatter paint like OCD Solutions recommended. I havent tested it yet though. It sprays like undercoat with white spatter in it. It's textured like undercoat as well, rough. It's been 50-60F in my garage and in some heavier spots it still hasn't dried. Spray a few coats, the first being a dry coat as the stuff lays light and gets blown around by trying to lay a heavier coat. It sprays fine and seems to stick better to itself rather than the primer coat.
The original paint in my WDK ROK is whats called Zolatone 20 series, and thats the real deal spatter paint they used in the old days for trunks. It's probably better and more durable, but it requires a pressure pot paint gun and something with a 2mm tip. The dupli-color trunk spatter paint matched it perfectly. Im giving it a few more days to be positive it's dry and then im laying a few coats of Duplicolor matte clear. A little bit more protection and lays on invisibly. A test panel proved it to smooth out the rough texture some.
Before I decided to do the trunk spatter, I was looking into high solids epoxy paints. Sherwin Williams carries some, although expensive. The epoxy paints are alot more resistant to solvents like gasoline.
Rustoleum makes appliance epoxy paint in a can. Don't mistake this paint as being extremely resistant to solvents. It's a water based epoxy, low VOC and is meant for kitchen appliances. It will work, but I wouldn't expect to last for years especially when you pull carb lines and drip gas.