2 pack wont stick to anything it will flake off the same as any other paint apart from truck paint everything needs to be keyed before paint is applied or it will flake off especially with the heat off the engine it will flake off even easier, you have to put down plastic primer onto plasitc or it will flake off even faster and for very flexible parts you have to put down a adhesive which has a flexible compound in the paint to stop the paint cracking (cant remember what its called )
out of all the paint companies ive used RM,SIKKENS,STANDOX,DUPONT,GLASURIT used all solvent and waterbased, none of them will stick without some sort of primer coat used before application to any surface. 2k have high isocyanates which arent exactly very healthy so where a mask. After spraying 12 cars a day (full resprays) in work with all spray equiptment i have a headache FROM THE FUMES!! WHO NEEDS DRUGS.
Quick Guide.
1. Take off rocker cover
2.sand with 240 grit to get rid of deep scratches dont go lower than 240grit as it is very gritty and causes deep scratches and will make the finished product if painting a silvery colour will show all the scratches.
3.600 grit wet flat the whole thing dont have to take down to bare metal its totally up to you.
4.etch the whole cover (if metal is showing through) wait to dry (untill its matted off) give it 2-3 coats of high build primer (if it needs it you can paint straight over the etch with your colour of choice if you are using a metalic i would high build prime it if using a direct gloss solid colour its thick enough to hide scratches that metalics show up.
5.spray a guide coat (a fine mist of any colour can use charcoal if you want to) over the primer this will show up orange peel and any other imperfections.
6.wet sand or dry sand once the primer is dry 600-800 grit dont really need to go higher than 800 sand out all imperfections shown up by guide coat if you rub through to metal you will have to etch again before final application.(if using a silvery colour paint use 800 grit.)
7.clean off cover with prepsol or wipe with thinners (dont use industrial thinners as it can depending on product used wipe off your paint!) to get rid of oil and finger print marks as they can cause problems with paint adhesion.
8.Now the best part blast away with your colour of choice.
9.If using cob (clear over base) wait for the base to dry all the way through before applying the clear (get a tack rag from a paint distributor to tack off your base coat before you clear, if you dont know what a tack rag is its a sticky rag that picks up bits of dirt or droplets of dry base coat on the surface very very good to have one.) all paint systems are different for clear applications so its up to you how many coats you give but dont really need to give it more than 3 depending how thin or thick you apply it .
Quick guide for people who dont know anything but want to paint rocker cover themselves.