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Adhesion
Poor Galvanized Metal Adhesion: Paint that has lost its adhesion to a
galvanized metal substrate.
Alligatoring
Patterned cracking in the surface of the paint film resembling the
regular scales of an alligator.
Blistering
Bubbles resulting from localized loss of adhesion and lifting of the
paint film from the underlying surface.
Chalking
Formation of fine powder on the surface of the paint film during
weathering, which can cause color fading. Although some degree of
chalking is normal, desirable way for a paint film to wear, excessive
film erosion can result in heavy chalking.
Mildew
Black, gray or brown areas on the surface of paint or caulk.
Nailhead
Nailhead Rusting: Reddish-brown stains on the paint surface.
Peeling
Loss of paint due to poor adhesion. Where
their is a primer and a top coat, or multiple coats of paint, peeling
may involve some or all coats.
Tannin Staining
Brownish or tan discoloration on the paint surface due to migration or
tannins from the substrate through the paint film. Typically occurs on
'staining woods,' such as redwood, cedar and mahogany, or over painted
knots in certain other wood species.