Plastic Parts

Vehicle manufacturers are using an increasing number of plastic body parts (for example, bumpers, spoilers, and in some cases, main body panels). If such parts are seriously damaged, they must either be repaired by a service station specialist or replaced. The basic repair technique consists of cutting a groove along the line of the crack using a grinding wheel fitted to an electric drill. The groove is then welded with plastic rod melted by hot air.

The excess plastic is then removed and the surface is leveled. It is important to use plastic rod of the same composition as the body part, since vehicles use different types of plastic (for example, polycarbonate, polypropylene).

Repair of less serious damage (scratches, minor cracks, etc.) can be carried out at a service station using epoxy filler. This filler is used in a similar way for body repair. Epoxy filler normally hardens within 20 to 30 minutes and is then ready for painting.

If the part is replaced completely, or if it has been repaired using epoxy filler, difficulties may arise in finding a suitable paint that is compatible with the type of plastic used. Until now, a universal paint has not been possible due to the wide range of plastics used in body components. Standard paints generally do not adhere well to plastic or rubber.

However, it is now possible to purchase plastic body parts together with primer and paint in various colors. Complete instructions are usually supplied with the kit, but in general the method is to apply the primer first, allow it to dry for 30 minutes, and then apply the topcoat. The result is a properly painted component, and the paint adheres well to the plastic or rubber.