Blacked out front of Roadster


I painted my grill (and the 2 smaller ones behind the rad). No sanding needed just a good clean and the right sort of paint (I used Rustoleum satin black) with several light coats. Have touched it up twice in 3 years to cover up what were almost unnoticeable stone chips but it holds up really well.
 
I used plastidip this week.the next day it began peeling,so I pulled it all off what a waste of money.
 
Did you prep the surface first, make sure no oil or grease on it?
I cleaned and de greased with petrol first then applied several coats.as I understand it that's all that was required.the edges peeled and when tightening the bolts the film spun round with the bolt.what a mess.i left it overnight to dry before doing this.i still have 2 cans left but would rather buy genuine black rad cowl....by the way it looks great on a classic with the blacked out cover.
 
I'm considering Plasti-diping the 'backside' of my new "sportshield". The clear coat afforded by the 1/16(?) inch thick plexiglass should give a decent gloss coat to the otherwise flat black "dip". It being removable would allow me to go clear again if later desired.