Shenzhen Alu Rapid Prototype Precision Co., Ltd.

Plastic molding, often made from PVC or similar materials, can be tricky to paint because it's non-porous and glossy, which makes paint adhesion challenging. However, with proper preparation and the right products, you can achieve a durable, professional finish. This guide focuses on interior PVC plastic molding (like baseboards or trim), based on expert and DIY advice. Always work in a well-ventilated area and wear protective gear like gloves and a mask.

Materials Needed

1.Mild detergent and warm water (for cleaning)

2.Scotch-Brite pad or 220-grit sandpaper (for scuffing)

3.Deglosser or tack cloth (optional, for removing residue)

4.Bonding primer for plastic/PVC 

5.100% acrylic latex paint 

6.High-quality sash or trim brush (2-inch angled) or small foam roller

7.Painter's tape and drop cloths (for protection)

Step-by-Step Guide

1.Clean the Surface: Start by washing the molding thoroughly with a mixture of mild detergent and warm water to remove dirt, grease, or oils. Rinse well with clean water and let it dry completely (about 1-2 hours). This ensures the primer and paint adhere properly.

2.Scuff the Surface: Lightly scuff the glossy plastic with a Scotch-Brite pad or 220-grit sandpaper to create a rough texture for better 3.adhesion. Avoid heavy sanding, as it can damage the molding. Wipe away all dust with a damp cloth or tack cloth, then let it dry.

4.Apply Primer: Use a bonding primer specifically designed for plastic or PVC. Apply one or two thin coats with a brush, following the product's instructions (typically, let the first coat dry for 1-2 hours before the second). This step is crucial for preventing peeling. For shiny plastics, a deglosser can be wiped on lightly beforehand to etch the surface without dissolving it.

5.Paint the Molding: Once the primer is fully dry (usually 24 hours), apply 2-3 thin coats of 100% acrylic latex paint. Use a sash brush for precision on edges and corners—load it lightly and paint in long, even strokes. Allow each coat to dry for 2-4 hours (or per paint instructions) before applying the next. For added adhesion, you can mix a bonding agent like Emulsa-Bond into the paint.

6.Cure and Inspect: Let the final coat cure for at least 24-48 hours before handling or exposing to moisture. Full curing can take up to 30 days for optimal hardness. Check for even coverage and touch up any missed spots.