White stains on red paint on 'barn' style house.

RJ and V asked 5 years ago

Last summer (2009) we applied two coats of an exterior latex water base deep red paint (clear coat base) to lightly textured, previously painted wood siding on our house. The house had been spray painted very pale green about 10 years ago. The surface was in good condition and only needed a light sanding and primer in a few places prior to our paint job. The white blotches, mostly about a foot long by a few inches wide, began to appear (and disappear again)shortly after we completed the paint job. The blotches are almost transparent and have appeared off and on on all four sides of the house. Is this still part of the ‘curing’ process or, if not, what would cause the blotches?

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