Sanding old paint off your walls before repainting can indeed provide better results, but it is not always necessary in every situation. The decision to sand the walls depends on several factors, such as the condition of the existing paint, the type of paint used, and the surface's texture.
Here are some reasons why sanding old paint can be beneficial:
Smoother Surface: Sanding can help create a smoother surface by removing any bumps, imperfections, or drips from the old paint. This will provide a better base for the new paint to adhere to and result in a more even and professional-looking finish.
Better Adhesion: Sanding the old paint creates a rougher surface that allows the new paint to adhere more effectively. This improves the paint's bond to the wall, reducing the risk of peeling or flaking over time.
Improved Paint Coverage: Sanding can also help improve paint coverage, as it eliminates glossy or slick surfaces that can hinder paint absorption. This is especially important when transitioning from a glossy to a matte or flat paint finish.
Paint Removal: If the existing paint is in poor condition, peeling, or chipping, sanding can help remove loose or damaged paint, reducing the chance of those issues affecting the new paint job.
However, there are situations where sanding may not be necessary or advised:
Good Condition of Existing Paint: If the current paint is in good condition, without any major imperfections or damage, you may be able to repaint directly over it without sanding.
Paint Type: Sanding is generally more effective for oil-based paints and high-gloss finishes. If you're repainting with the same type of paint, sanding may not be as critical.
Lead-Based Paint: If your home was built before 1978, there's a possibility of lead-based paint being present. Sanding lead-based paint can create hazardous dust, so it's essential to take proper precautions or seek professional assistance.
Latex or Acrylic Paint: Latex or acrylic paints are more flexible than oil-based paints and may not require sanding for good adhesion.
Before sanding, consider conducting a small test area to assess the condition of the existing paint and how well it adheres. If you decide to sand, use fine-grit sandpaper, such as 120-grit or higher, and ensure to clean the walls thoroughly afterward to remove any dust generated from sanding.
Ultimately, if you're unsure about whether to sand or not, consulting with a professional painter can provide valuable advice based on the specific condition of your walls and the paint you intend to use.