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Wax
Bleed: Stains that come from waxy substances in the
reconstituted wood products used to make hardboard siding.
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 Causes:
Failure to apply a proper primer to hardboard before
applying the top coat.
Allowing hardboard siding to weather before being painted.
Solution:
To treat or prevent, apply a quality exterior acrylic
latex primer; follow with a coat of high quality exterior
acrylic latex paint. The American Hardboard Association
recommends two coats of top quality acrylic exterior house
paint for best results. Some hardboard grades have
adequate factory primer and need only a quality paint
applied. Low quality, highly pigmented flat paints are
more prone to wax bleed than are higher quality paints.
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