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Several small spots on the GP Material belly band on my manufactured home have puffed up due to water ingestion. They are small and were caused by watering plants next to bad spot. I was planning on just cutting out the bad spots, then using caulking to seal and reshape the removed material, then repainting. 99% of the boards are still dry and perfect. Any ideas so I can proceed before bad weather arrives?
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Your plan sounds solid, and you're definitely on the right track. Since you caught this early and 99% of your boards are still in perfect condition, cutting out those small puffed areas and sealing them is absolutely the right move. Make sure the area is completely dry before you start. Use a sharp utility knife to score clean edges around the damaged spots before cutting to avoid tearing into the surrounding good material. For filling and reshaping, an epoxy-based exterior wood filler is a great choice because it expands and contracts with temperature changes and won't shrink or crack after curing. However, since manufactured home siding is often a composite material, flexible sealants can move with the material better than rigid fillers. A high-quality, paintable exterior caulk can work well for smaller areas and might be the safer choice for this type of siding. Be sure to prime any exposed raw edges before painting to properly seal and protect the material. Since this was caused by watering nearby plants, you might consider adding a small drip edge or adjusting your watering routine to help prevent splashback in the future. It's great that you're tackling this before the weather turns. Repairs like this are much easier when everything is dry, and addressing it now will help keep the rest of your siding in excellent condition.
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