Brumalia Hardware Limited Tools & Tips
Poor Gloss Retention
Deterioration of the paint film, resulting in excessive or rapid loss of luster of the top coat.
Use of an interior paint outdoors.
Use of a lower quality paint.
Use of a glossy alkyd or oil-based paint in areas of direct sunlight.
Direct sunshine can degrade the binder and pigment of a paint, causing it to chalk and loss its gloss. While all types of paint will lose some degree of luster over time, lower quality paints will generally lose gloss much earlier than better grades. The binder in top quality acrylic latex paint especially resistant to UV radiation, while oil and alkyd binders to break down. Surface preparation for a coating showing poor gloss retention should be similar to that used for chalking surfaces.
Poor Alkali Resistance
Colour loss and overall deterioration of paint film of fresh masonry.
Oil-based paint or vinyl acrylic latex paint that was applied to new masonry that has not cured for a full year. Fresh masonry is likely to contain lime which is very alkaline. Until the lime has a chance to react with carbon dioxide from the air, the alkalinity of the masonry remains so high that it can attack the integrity of the paint film.
Allow masonry surfaces to cure for at least thirty days, and ideally for a full year, before painting. /If this is not possible, the painter should apply a quality, alkali-resistant sealer or latex primer, followed by a top quality 100 percent acrylic latex exterior paint. The acrylic binder in these paints resists alkali attack.
Peeling
Loss of Paint due to poor adhesion. Where there is a primer and top coat, or multiple coats of paint, peeling may involve some or all coats.
- Seepage of moisture through unchaulked joints, worn chaulk or leaks in roof or walls.
- Excess moisture escaping through the interior walls( more likely if paint is oil based).
- Inadequate surface preparation.
- Use of lower quality paint.
- Applying an oil-based paint over a wet surface.
Try to identify and eliminate source of moisture. Prepare surface by removing all loose paint with scrapper or stiff wire brush, sand rough edges, and apply appropriate primer. Repaint with a top quality acrylic latex exterior paint for best adhesion and water resistance.
Mildew
Black, gray or brown areas or fungus growth on the surface of paint or caulk.
- Forms most often on areas that tend to be damp, and receive little or no direct sunlight ( walls with a northerly exposure and the underside of eaves are particularly vulnerable).
- Use of lower quality paint, which may have an insufficient amount of mildewcide.
- Failure to prime bare wood before painting.
- Painting over a substrate or coating on which mildew has not been removed.
Test to distinguish mildew from dirt by applying a few drops of household bleach to the discolored area; if it disappears, it is probably mildew. Treat the mildew by applying a mixture of water and bleach 3:1, and leave on for twenty minutes, applying more as it dries. Wear goggles and rubber gloves. Then scrub and rinse the area. Apply an exterior latex paint in flat, satin, semi-gloss finish, depending on the desired appearance.
Fading
Premature and/or excessive lightening of the paint colour, which often occurs on surfaces with sunny southern exposure. Fading/ poor color retention can also be a result of chalking of the coating.
- Use of an interior grade of paint for an outdoor application.
- Use of a lower quality paint colour that is particularly vulnerable to UV radiation( most notably certain bright reds, blues and yellows).
- Tinting a white paint not intended for tinting, overtinting a light or medium paint base.
When fading/ poor colour retention is a result of chalking, it is necessary to remove as much of the chalk as possible. When repainting, be sure to use a quality exterior house paint in coluors recommended for exterior use.
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