Efflorescence can be avoided by ensuring the substrate is free of moisture prior to painting and that all areas where moisture may enter the substrate are sealed.Īlkali burn is the deterioration of a paint film caused by excessive alkalinity (pH). To remove efflorescence from painted surfaces, use fresh water and a stiff brush to clean, or an efflorescence cleaning solution for difficult areas.ĭo not paint directly over efflorescence as moisture in the paint can cause salts to return to the surface. It shows as a hard, white substance on the surface and is a common occurrence on masonry. Moisture dissolves the internal salts of a substrate and they migrate to the surface as the moisture evaporates. Light chalking can be primed with an appropriate sealer.ĭo not paint directly over heavy chalking as it can cause adhesion loss of the new paint.Įfflorescence is the migration of salt to the surface of a porous substrate that forms white crystalline deposits. To remove chalking, clean with fresh water using a new soft cotton cloth, sponge, or power washer. It shows as a dusty or chalky substance on the surface of the paint. Use a high quality waterborne acrylic finish to avoid future yellowing.Ĭhalking can occur over time as weathering and UV light break down a paint film. Priming and repainting is required to repair yellowing. It can be accelerated if the paint film is shaded from light or exposed to ammonia during the curing process. While alkyd or solvent borne paints offer some performance benefits, yellowing of these products occurs naturally over time. If you are unsure of the cause or need additional advice, contact a local Kelly-Moore representative. It is important to determine the cause of the peeling, blistering, or delamination issue and to correct that problem before patching and repainting. Then, smooth the area with an appropriate patching compound, prime, and repaint.
To repair peeling, blistering, or delamination, carefully remove the damaged paint. Some of the most common causes are when moisture enters the substrate behind the paint film and when paint has been applied to inadequately prepared surfaces. Peeling, blistering, and delamination can occur from a wide range of causes.
Surfactant leaching can be avoided by keeping the paint film free of moisture and above recommended temperatures for at least 24 hours after application. To remove surfactant leaching, clean with fresh water using a new, soft cotton cloth, sponge, or power washer.ĭo not paint directly over surfactant leaching as it can cause the surfactants to return to the surface. It shows as surface staining or sheen variation and feels like a soapy or sticky substance. Surfactant leaching can occur when waterborne paints are exposed to excessive moisture or cold temperatures during the curing process.
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