Between applying coats of multi-component film-forming products if required, what is done?

• A. Sanding between coats.
• B. Cleaning with solvent between coats.
• C. Heating between coats.
• D. Cooling between coats.

Answer: (A)

Creating a good mechanical key between coats is crucial for multi-component film-forming finishes. Light sanding between coats roughens the surface, removes nibs and gloss, and provides a rough texture for the next layer to adhere to. This improves adhesion and helps the final film look smooth and uniform. After sanding, wipe away dust and follow the product’s recoat timing. Cleaning with solvent can be useful to remove contaminants if needed, but it doesn’t create the necessary key for adhesion. Heating or cooling between coats isn’t standard practice and can affect cure and film properties. So, sanding between coats is the recommended step when required.