Wax Bleed
Stains that come from waxy substances in the reconstituted
wood products used to make hardboard siding. However,
wax bleed areas bead water and mildew does not. When
the substrate is painted, these staining substances
bleed through the paint; they can even bleed through
some ordinary primers, possibly causing dirt pickup,
mildew and/or poor paint adhesion (see dirt pickup and mildew).
Possible Cause:
Solution:
To treat or prevent, apply a coat of quality exterior acrylic
latex primer followed by a coat of quality exterior acrylic
latex house paint. Two coats of are recommended for best results.
Some hardboard grades have adequate factory primer and need
only a quality paint applied. Low quality, high pigmented
flat paints are more prone to wax bleed than are higher quality
paints.
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