Promatic Plastic Primer Adhesion Promoter 500ml. Promatic plastic primer is specifically designed to promote adhesion to various plastic substrates including automotive plastics, vinyl, trim, bumpers, fiberglass, melamine and more... It is quick drying and can be overcoated with most paint systems. Use on your project prior to priming. Available in a large 500ml can size. Improves adhesion of most paints on difficult plastic substrates quick drying ideal for interior or exterior use. Cleaning Ensure surfaces to be coated are dry and must be cleaned using an appropriate product to remove all traces of contaminants. Application Spray over project from around 15cm building up several light coats ensure sprayed surface is smooth and then apply top primer coat, and finally apply top coat finish. Surface can be sanded to ensure smooth surface. Coverage 1-2 square metres per 500ml aerosol.