Top 5 Reasons your Exterior House Paint Failed
2. Unfinished siding was exposed to several weeks of sunlight before painting.
3. Temperature was too cold when wood was painted. Oil-based paint should be applied when the temperature is at least 40ºF; for latex paints, it should be 50ºF.
4. Weather was too humid when the surface was painted. When it is too humid, water cannot evaporate and the solvents may evaporate first, causing the paint to cure while still in a water-filled state.
5. Brown stains appear on the surface of the paint. Moisture that traveled through the wood pulls water-based extractives through the paint, leaving brown stains on the surface of the paint.