Rick's stuff is the stuff to use for sure.. make sure you tape off where you don't want it because it does fly all over the place..

I use a little different method, I took a shutz gun and drilled the end out wider, Thin coats about 20 mins between and i use real low psi 15-20 lbs.. It spatters and spits out of the gun but its the closest to factory I've been able to duplicate..