Common Painting Problems

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A Pool proof Guide For Choosing Exterior paint Colors

Bonnie Rosser Krims

Common Painting Problems
Common Painting Problems

ChalkingExisting paint looks like it has a layer of chalk dust. run your finger across it. if you pick up a layer of residue, you will need to wash the house with trisodium phosphate (tsp) or another strong detergent. work from the top down with a scrub brush or use a power washer.
Mildewwash mildewed areas with chlorine bleach solution and soap. use 3 parts soapy water to 1 part bleach.
Metal stainswash stains off wood before priming. prime metal before painting to keep stain from bleeding onto wood.
RotDry or wet rot must be removed or killed with a biocide. patch holes. stabilize damage with resinous wood hardener. patch with resin fillers.
Knotsspot prime knots with pigmented shellac (latex or oil based) to seal out the resin.
Nail holesfill with exterior spackle compound or linseed oil putty.
Uneven, chipped, or peeling paintscrape (go with the grain) and sand or strip if necessary before priming using a heat gun or chemical stripper.
Cracksuse exterior spackle compound to fill small cracks in wood siding, cracks or gaps between different kinds of building materials (e.g., wood and masonry, wood and metal, plastic and metal; also joints between two pieces of wood in a window or door frame), and small cracks in stucco. repair large cracks in stucco with stucco patch. repair large cracks in wood with resin fillers.
Cracked window glazingIf window glaze has shallow surface cracks, add new glazing compound over it, if glaze is badly cracked, use a heat gun to remove old compound back to a clean sash, prime and reglaze the window
Alligatoring and crazingThese paint conditions are caused by paint drying faster than it should or by putting on too thick a coat of paint scrape, sand, and patch affected areas before priming
BlisteringThis condition is caused by painting over surface dirt of moist wood. moisture is trying to escape from behind the paint. scrape and sand affected ;areas before priming.
EfflorescenceThis condition,in which salts crystallize on a masonry surface, is caused by mineral salts reacting with water. scrape away deposits and let dry completely. use only water based paints, which allow remaining water or moisture to dry through the painted surface.
Loose plasterThe plaster layer on a wall sometimes breaks away from its block base, making the wall surface unstable. plaster tends to break down in localized areas. loose plaster should always be removed and the surface patched.
Rust stainsThis brownish staining is caused by external metal fixtures or old nails that corrode and wash down masonry walls in the rain. paint all metal fixtures, then clean stained areas and seal them with an oil-based undercoat.

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