Based on best practices and the provided reference, the most effective way to paint over a sealed joint is not by painting directly onto the existing sealant, but by preparing the surface properly beforehand.
For a sealed joint that you want to paint, such as along the top of skirting boards or around a window frame, the recommended method is to remove the existing silicone first, caulk the joint, then paint. This process is advised because it will provide a longer lasting and superior finish compared to painting directly over silicone.
Why Not Paint Directly Over Silicone?
While the reference doesn't explicitly state why, silicone sealant is known for its non-porous, flexible, and often slick surface. Paint typically does not adhere well to silicone, leading to peeling, cracking, or poor coverage over time. Using a paintable caulk ensures a surface that is designed to accept paint, creating a smooth and durable finish.
Recommended Steps
To achieve the best results when you need to paint a joint that was previously sealed with silicone:
- Remove the Old Sealant: Carefully cut and scrape away all of the existing silicone sealant from the joint.
- Clean the Area: Ensure the surface is clean, dry, and free from any residue of the old sealant, dust, or debris.
- Apply Paintable Caulk: Fill the joint with a high-quality, paintable caulk. Smooth the caulk bead using a finger or a caulking tool.
- Allow to Cure: Let the caulk dry completely according to the manufacturer's instructions. This curing time can vary significantly depending on the product and environmental conditions.
- Paint: Once the caulk is fully cured, you can paint over it to match the surrounding surface.
Following these steps, as suggested by the reference, ensures that your painted joint will look better and last longer.
