Dirt, Stain, Discoloration

Unwanted increase in gloss or sheen of the paint film as a result of rubbing, scrubbing, or having an object brush up against it.

The formation of fine, white powder on the surface of the paint film due to weathering.

Appearance of mildew, but affecting a widespread area and does not lighten when tested with bleach. 

Accumulation of dirt, dust particles, and/or other debris on the paint film.

White, fluffy deposits of salt crystals on masonry surfaces.

Premature and/or excessive lightening of the paint color.

Failure of dried paint to properly obscure or conceal painted surface.

Black, gray, green, or brown spots on any surface.

Deep, irregular cracks resembling dried mud in the dry paint film.

Reddish, brown (or sometimes black) stains appearing as blotches or streaks on surface or paint (see also Tannin Staining).

The wearing away or removal of the paint film when scrubbed with a brush, sponge, or cloth.

Stains in the paint surface caused by virtually anything that would bleed, leak, or stick to the paint film 

Brownish or tan discoloration on the paint surface (see "Rust").