Plastic Coatings Plastic substrates require special consideration because of four major concerns:
- Heat sensitivity
- Low energy
- Surface solvent sensitivity
The low energy surface of some polymers can created problems with adhesion. Substrates such as poly olefins, poly propylene and poly ethylene are extremely difficult surfaces on which to achieve proper and sufficient adhesion. Acrylic Thermoplastic paints are used both as base coats and top coats in vacuum metalizing applications on a number of plastic substrates including ABS, HIPS, Noryl and PC. The function of the base coat is to provide a good key between the substrate and the vaporized Al metal and to fill the imperfections of the substrate, thus enhancing the brightness and reflectivity of the deposited metal.