right here's how I've done my engine cover, plenum, battery and brake fluid cover, plastic surrounds:
what you need:
sandpaper (medium and fine)
colour cans (or spray gun) I used normal paint, not thermal, and it's fine for the above. Nissan burger comes off.
primer (plastic primer preferred)
lacquer
1- sand down plastics with medium sandpaper
2- first coat of primer
(wait at least 30 mins)
3- sand down with fine sandpaper
4- second coat of primer
(wait at least 30 mins)
5- sand down with fine sandpaper
6- 3rd coat of primer
leave overnight
following day:
1- sand down plastics with fine sandpaper
2- first coat of colour
(wait at least 30 mins)
3- second coat of colour
(wait at least 30 mins)
4- 3rd coat of colour
preferaable many more thin coats of colour
leave overnight
then on day 3
1- sand down plastics with fine sandpaper to get rid of shine of colour
2- first coat of lacquer
(wait at least 30 mins)
3- second coat of lacquer
(wait at least 30 mins)
4- third coat of lacquer
leave overnight
NOTE: don't use too much colour/laquer in one go otherwise paint/laquer will run