Small holes in the paint surface due to pores and voids in the plastic. This problem often appears on soft flexible parts (e.g., polyurethane rear spoilers) and glass fiber-reinforced plastics.
Causes
Expansion faults or foam holes in the plastic from production
How to avoid
Thoroughly check the plastic part for pores before painting. Then fill the pores using Plastics Body Filler gray.
Repair
Porous paintwork can, in principal, be repaired using the pore filler wiping process. Denib the surface, fill the pores with and refinish the area to be painted. Note: Too many pores in the plastic will make it very difficult to paint. It is important to check the plastic for pores thoroughly before painting.