Opinions on using Rattle Can for TOP of dash

[BrianG]

I'd like to hear some opinions about weather or not using rustoleum in a rattle can will hold up for the top of the dash. I am talking abut the area between the dash pad and the windshield. The painter painted it glossy black like the rest of the truck. I talked to them about it and they said, "just spray it semigloss with some rustoleum in a spray can". Which I did. Now, the more I read about the differences in paints, I'm a little worried that I'll have issues using the rattle can. So.... Is this an area where the hardener will really make a difference? I don't have the best paint gun or painting skill, but I could attempt to mix some paint and do it. Right now it looks alright after putting some semi gloss rustoleum from a spray can on it. Honest opinions from both perspectives would be appreciated.