The biggest part in painting interior plastics will be the PREP!!!! The more time you take in cleaning the plastic of all oils and debris the better the paint will stick. Try washing the peices with dawn it does a good job of "cutting the grease away". Then you want sand the pieces with a fine grit sand paper prolly around 400-600 then hit it with some 800. Then wash the pieces again and when they are dry wipe them down with a cleaner called Preps All (at local parts stores). Then you are ready to paint. When you are paintiing use light coats and dont try to cover it all at once. With multiple coats and some 10-15 min drying time between coats should keep it from fish eyeing or running. If you need to you can sand between coats and then reprep and spraying again. Remember, the most time is spent preping and this is not a job that you can rush through. By the way I have used VHT paint and it works very well and seems to be very durable. This I know from experience......any other questions feel free to ask.