listen if ure serius about having ure dash sprayed i would have it done profesionaly although i did mine my self it cos me just as much as a gargae would charge to get it right, if ya just spray it with primer, paint, laquer it goes hard and cracks in the sun the best thing is to use a spray gun and use 2pack paint like you would if spraying on outside becaus it is alot more durable.
saying that i will say it doesnt last forever as it is constantly being cooked by the windscreen so the paint fades mine lasted 12months b4 it started to fade with sun best have real think about it b4 you spray
mick