Paint Doesn’t Stick to Dirt
Paint won’t adhere very well to dirty or rough surfaces, so be sure to thoroughly clean the siding and trim, allow it to dry and then sand the rough surfaces. Be sure to sand (or scrape as needed) any peeling paint to create a solid surface for the paint to adhere. IF YOU NEED A PROFESSIONAL PREP HOUSE CALL US.
Paint Also Won’t Stick to Rotten Siding
Rotten wood and siding material are nearly worthless to paint, as they will do nothing but continue to deteriorate. You have a couple of options. Replace the siding or wood trim with new components, or in the case of small areas, use a wood hardener and match with an exterior filler product, such as a wood filler. Be sure to prep and sand either one prior to painting.