I've done it on my golf... You definately don't want to paint the inside as the actual plastic is dyed amber it would look like cr@p.
Lot's of sanding and wet sanding.
I used Testor's transparent candy apple red, most hobby stores should have it. Use lot's of light coats instead of one heavy coat.
The apply some clear coat.
Here is a picture of the end result without the clear coat: