Will RIM Take Over Spray Painting?
Reaction Injection Molding (RIM) is a process in which liquid reactants are mixed and cured within a mold. RIM doesn’t need painting because the color comes out as soon as it’s demolded. Pigments are mixed directly into the polymer and injected into the mold, so the panel already has its final color when it comes out — painting free. But what about the traditional wet coating steps such as — anti-corrosion, stone chip resistance, weather resistance & varnishing — they all work independently. Where do those functions go? "Painting-free" RIM eliminates the need for coloring, not the surface coating. Let’s first clarify the principles of this process; otherwise, the subsequent criteria table—showing which layers can be replaced and which cannot—won't make sense. In traditional spraying—whether it involves electro-deposition (ED), primer,…



