Preferred Painting offers all types of applications including; no odor latexes, polomyx, aquaflec, faux finishes, all types of wall coverings, floor sealant & enamels, aliphatic urethane, water proofing products, and standard latexes & oils.

In order to give you a brief overview of some of applications we can provide we have listed a few common problems and the solutions that we provide. Enjoy!

Problems
• Peeling from Concrete Floors

• Peeling from Masonry and Brick

• Peeling from Hardboard Siding

• Peeling from Galvanized Metal

 

Problem: Peeling from Concrete Floors
Cause: Concrete floors present numerous potential adhesion problems for coatings. Concrete is a highly alkaline material which reacts chemically with oil or alkyd based finishes to weaken their adhesive bond. Concrete also transmits moisture bringing soluble salts, to the surface (efflorescence). This will gradually generate a sandy or dust-like condition at the surface. Grade level or sub-surface floors are continually subjected to moisture penetration. All concrete should be cast over a vapor barrier. Sub-surface concrete should also be case over a generous level of gravel with further means to remove water when conditions are severe. Moisture is the primary cause for adhesion failure. Other possible causes include hard-troweled concrete which presents a physical barrier to adhesion by not permitting penetration of coatings. Older concrete can become crumbly, and accumulations of grease or oil create a barrier limiting adhesion.

Solution: Remove paint by scraping and sanding. Clean floor by scrubbing with hot water and a strong detergent solution. Avoid mild dishwashing detergents. These contain skin softening ingredients which interfere with paint adhesion. It may be necessary to use chemical stripper, if the above procedure fails to remove the paint. Follow the directions carefully. Floors that have been subjected to long term oil and grease must be aggressively scrubbed with a grease dissolving compound, such as Benjamin Moore M83 Industrial Maintenance Oil and Grease Emulsifier. Follow the label directions carefully. In all cases, rinse the floor thoroughly. Allow the surface to dry for several days. The next step, called etching, requires protective goggles, boots, and rubber gloves to be worn during the process. Mop on 10% solution of muriatic acid and water to clean floor. Always mix acid into the water, never mix water into acid. Allow solution to remain on surface until bubbling ceases (10 to 16 minutes). Flush surface with water and dry completely. When floor is properly etched, it should resemble texture of fine sandpaper. Etching neutralizes the alkaline surface and provides a better bond. It also helps remove salt deposits (called laitance) that can occur of loose concrete. The floor should now be ready to paint.

Problem: Peeling from Masonry and Brick
Cause: A common cause of peeling on surfaces composed of mortar, brick, building block or concrete is efflorescence, where soluble salts are present. When dissolved by water, they are carried to the surface and remain after the water has evaporated. These salts can push paint away from the surface and peeling results. Efflorescence occurs on brick walls of new construction. A common building practice is to treat new brick or concrete with muriatic acid, rinsing with water to clean away excess mortar. Rinsing removes only those salts on or near the surface. After painting, salts remaining within the bricks will absorb the moisture and travel to the surface, causing peeling. Peeling can also occur when alkyd or oil paint is applied over unetched concrete. Alkyd resins that come in contact with a alkaline surface form a soap film between the concrete surface and the coating, called saponification. This will cause softness and loss of adhesion of the alkyd coating.

Solution: If efflorescence is evident, it must be removed before repainting. First, remove all flaking or chalking paint from the damaged area by wire brushing or sandblasting. If necessary, try applying a solution of 5% muriatic acid or undiluted vinegar. Rinse with clean water. Fill all cracks with masonry patching compound, latex concrete patch, or caulking compound. If the surface is very porous, apply an alkai-resistant primer or block filler. Cover with latex house paint. To prevent recurrence of efflorescence on interior walls, the exterior walls should be sealed. Note: Extraneous water sources must be removed before painting (e.g. migration at ground level, often caused by poor drainage).

 

Problem: Peeling from Hardboard Siding
Cause: Hardboard siding is reconstituted natural wood. It is fabricated by reducing natural wood to fibers, adding resins, and then pressing the fibers together into panels. It can be either tempered or standard. Tempered board is denser and has a higher moisture resistance. Standard hardboard should not be used outdoors in areas where it will be directly exposed to the weather. Peeling is often due to poor maintenance of the coated surface. It generally originates with bare hardboard in these areas eventually penetrates into the board to repeatedly permeate and expand the compressed wood fibers in the board. The swelling process is irreversible, resulting in delamination of both the paint film and the board.

Solution: Whether supplied bare or factory primed, hardboard must be primed. All joints or bare edges must be primed and caulked to avoid contact with water. Coated hardboard surfaces require regular maintenance to detect possible areas of deterioration or cracking before board failure occurs on a large scale. Where cracking or peeling is observed, it MUST be scraped and sanded immediately, then primed, caulked if necessary, and top coated. All loose paint must be removed, and the edges of the areas of good paint should be sanded smooth.

 

Problem: Peeling from Galvanized Metal
Cause: Improper priming of surface. Chemicals on new, unweathered galvanized surface. Rusting. When alkyd or oil-based product is applied over bare galvanized surface, a chemical reaction occurs and a soap film forms between metal and coating.

Solution: Remove all loose, flaking paint down to bare metal. Galvanized metal must be clean, dry, and free of oil or grease. Wipe new metal with mineral spirits to remove any oil film remaining from manufacturing operations.