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House Painting in Concord – Interior Surface Prepping By Substrate

House Painting in Concord – Interior Surface Prepping By Substrate

Before doing any house painting in Concord, proper preparation of the surface will help the paint to adhere to it better. The surface to which the paint adheres is called a substrate. You may need to prepare different substrates by following these tips.


Sheetrock is also called wallboard or drywall. It is generally used for ceilings and walls in homes and businesses. Both sides of the sheetrock, which is compressed gypsum plaster, are covered with thick paper. You can purchase sheetrock with fire-resistance and moisture-resistance qualities. If you want the best surface, it is best to prime the sheetrock prior to painting.

Be sure to sweep or vacuum the sheetrock prior to painting. This will remove dust caused from joint compound that has been sanded. Then, using PVA (poly-vinyl acetate) or a latex primer, prime the walls and allow them to dry completely before painting the color on the walls. When you paint the final coat of paint, be sure to “cut in” with a brush before you begin rolling the paint to the remainder of the walls.

Plaster or veneer plaster

Plaster, also called veneer plaster or skim coat, is a type of cementitious substrate. It is subject to alkalinity and efflorescence (e.g., it tends to produce white powder and has the properties of limestone or chalk, which is carried to the surface by water).

Plaster surfaces need to cure for 30 days. The plaster’s moisture content should not be more or less than 15%. Plaster has high levels of calcium, and because plaster is subject to alkaline contact, an acrylic latex primer should be applied on plaster substrates. Aside from offering better surface adhesion for paints, an acrylic latex primer also offers protection from alkyd products (which can react to free alkali and thus make the surface less adhesive to paint).

It is extremely important to follow this one tip if you are using a plaster substrate – DO NOT sand plaster before it has been primed. Before applying prime, it is important to first brush off or vacuum any efflorescence and loose surface material. Like in any preparations, repair the flaws such as removing nibs, cracks or nail grooves by using patching compound. Then prime the surface and allow it to dry completely before painting the color on the walls.


Wood or plywood is one of the commonly-known and acceptable substrates. Wood or plywood should be completely dried with a moisture content of less than 10% when installed. When prepping wood or plywood, you should fix surface flaws such as holes and voids that need to be filled. Sand the surface to make it smooth and then be sure to clean off the sanding residue. You will want to use a primer with wood or plywood to hide the wood grain so you have the smoothest surface possible.

The substrates above are the most commonly used in houses and many businesses. When you are ready to begin painting, consider the type of substrate you have to determine how best to prepare it for painting. Then, when you are ready to begin house painting in Concord, you’ll know what to do.


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