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Did you use a pressure washer on the house before painting.
If you use a pressure washer to strip peeling paint and wash off dirt and mold , a lot of water gets forced into the siding/shingle etc and it takes a long time for that moisture to dry out before you can paint over it.
i once saw a guy pressure wash his house then paint over it the same day. the paint job looked beautiful until about 2 hours later when it all started to slide off like it was melting butter.
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