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Best freaking paint on the planet for painting plastic JUST under the pro level IMO, FOLLOW the directions, as stated above, some great advice; 6-8 THIN layers and let each DRY IN THE SUN for 10 MIN before apply the next one. TAKE YOUR TIME, do it right the first time.
ROCK HARD TOO, THAT PAINT WON'T SCRATCH AS EASY like other paints and I'd think watches, rings, keys, drink cups etc. will come into contact with that area possibly, so I'd clear coat it too. (glare)
In my 20 years of 'rice'ing up' cars, I've had both good and bad experiances with painting the interrior of a vehicle, i.e. vents, steering wheels, dash, knobs, door trim, etc. etc. and I have to say that paint I liked above is/was the BEST results I've ever had. Now for the sad part...
(bang) can't get that paint over here in Okianwa and the wife and I have looked some, but no luck so far. I know sending paint / chems via postal mail is a pain in the ass to get here, ... *sigh*
Anyhow, good luck, post some pictures please when you get it done. Don't forget to use the 'flower' setting on your camera and get some real close up ones, show the detail of the paint.
Peace!(rei)