Problems and Fixes - Interior Paint

Sagging can be caused by:
-- Applying the paint too heavily
-- Painting in humid or cool weather
-- Thinning the paint
-- Spraying with the spray head too close

Solution:
-- Before repainting -- Sand all glossy surfaces. Sand sags flat and reapply a new coat of paint.
-- During application -- Do not thin the paint or overapply it. Two coats at the recommended spread rate are better than one heavy coat. Avoid cool or humid conditions. If the paint sags as you apply it, immediately brush it out or reroll it evenly.

Blistering can be caused by: -- Applying oil-base paint over a damp or wet surface
-- Outside moisture seeping in through the interior walls
-- Exposing latex paint to high humidity or moisture shortly after paint has dried

Solution:
-- Remove any source of moisture, if possible. Repair loose caulking. Remove blisters by scraping and sanding, prime bare spots, and repaint with a quality acrylic latex interior paint.

Burnishing can be caused by:
-- Using flat paint in high-traffic areas
-- Frequent washing and spot cleaning
-- Objects rubbing against the walls
-- Low-grade paint

Solution:
-- Paint heavy-wear areas that require regular cleaning with a scrubbable latex wall paint. In high-traffic areas, choose a semigloss or gloss rather than a flat sheen. Clean painted surfaces with a soft cloth or sponge and nonabrasive cleansers.

Cracking and flaking can be caused by:
-- Low-quality paint with inadequate adhesion and flexibility
-- Over thinning or overspreading the paint
-- Improper surface preparation, or failure to prime the surface
-- Excessive hardening and embrittlement of alkyd paint as the paint ages

Solution:
-- Remove loose and flaking paint with a scraper, sand and feather the edges. Fill deep cracks in multiple layers of paint. Prime bare wood with a top-quality primer and paint with a high-quality finish coat.

Blocking can be caused by:
-- Closing doors or windows before the paint is dry
-- Low-quality semigloss or gloss paint

Solution:
-- Use top-quality semigloss or gloss acrylic latex paint.
-- Apply talcum powder to mating surfaces to relieve persistent blocking.

Roller marks or stipple can be caused by:
-- Using a low-quality roller cover or one with the wrong nap
-- Low-grade paint
-- Incorrect rolling technique

Solution:
-- Use a high-quality short-nap roller cover and high-quality paint whose higher solids content rolls on and levels more evenly.
-- Dampen roller covers before loading with latex paint; shake out excess water.
-- Don't let paint build up at roller ends. Begin rolling at a corner near the ceiling and work down the wall in 3-foot-square sections. Spread the paint, beginning with an upward stroke to minimize spatter; then, without lifting the roller from the surface, bring the roller back with a downstroke. Finish the section with light, parallel strokes.