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  • Interior Painting FAQ

    Interior:  Surface Preparation FAQs

    Q: Why do I need to use a primer instead of just using two coats of the finish paint?

    A: A primer is beneficial because it helps provide a uniform surface that promotes good adhesion of the topcoat. A primer can also serve a special purpose by sealing a porous surface, blocking out stains, preventing rust formation on iron and steel, and preventing tannin bleed on wood. Most finish paints are designed to provide a decorative or protective finish for a substrate. In most situations, they do not provide the features of a primer, so it is always important to follow the manufacturer's recommended coating system.

    Q: What is hatbanding and what causes it?

    A: Hatbanding is a phenomenon that appears as a stripe at the edges or top of a wall. It occurs when the brushed "cut-in" area is dry when the wall is rolled. By not rolling onto a wet edge, the difference in the texture of the brushed paint and rolled paint becomes very visible. Hatbanding is corrected by applying another coat of paint, keeping a wet edge of cut-in areas.

    Q: What causes fisheyes?

    A: Fisheyes are caused by some type of surface contamination that was not removed in preparation for painting. This contamination can be from body oils, silicone from furniture polish, or any greasy or oil substance. The slippery deposit on the surface does not allow the paint to adhere, causing it to shrink away from the contamination and form a dimple-like void in the paint film.

    Q: What types of cleaners can I use to remove mildew?

    A: Try using a solution of one quart household beach in three quarts of water. Apply the solution to the area with mildew and then rinse off with water. Never add detergents or ammonia to the bleach/water solution. Always protect your skin and eyes against splashes.

    Q: I need to paint a residential ceiling that has been stained from a previous water leak. What is the best approach to sealing the stain before applying flat ceiling paint?

    A: I suggest you take care of all the repair work first, then apply an alkyd primer-sealer, such as ProBlock, to seal out the water stains.

    Q: Can I apply latex paint over a surface finished with an oil-based product?

    A: Yes you can. You have two choices to do this. First would be to wash the surface, sand and then clean the sanding dust off. You may then apply your latex paint over the oil base paint. That process works for both interior and exterior applications. Your other option is to wash the surface and then apply a coat of a adhesion primer and then topcoat.

    Q: Can acrylic latex house paint be applied over gloss alkyd paint? Is special prep work necessary to ensure good adhesion?

    A: Yes, to both questions. But, to ensure good adhesion, glossy surfaces must first be washed clean and then sanded to allow the paint to "grip" the surface. Gloss alkyd paints that are exposed to harsh weather conditions have a tendency to "chalk" - that is, the old paint film develops a faded, powdery substance on the surface. So it's best to wash off any excessive chalk prior to applying an acrylic topcoat. When painting bare surfaces, use an appropriate primer before applying the topcoat. This will ensure the best adhesion and long-term durability.

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CertaPro Painters of Minnetonka, MN
4737 County Road 101 #176
Minnetonka, MN 55345
Ph: 952-994-4443