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Facade painting

When painting a wooden or masonry facade of a house, everyone can make mistakes. What are the most common ways to prevent them and fix them more easily?

To avoid later painting defects, always buy only paints of suitable quality for outdoor use. They can also be better than desirable, but not worse, although this is a purse issue. Lower quality paints are always a problem in the future, and the stingy will pay twice again. The seller – consultant usually takes care of the right choice in specialized stores.

It is always wise to research the surface to be repaired. A defect such as cracking (crocodile skin) often occurs when repainted with an oil or alkyd paint surface that has been coated with a water-dispersion paint. If resin-rich coniferous wood is used for the facade cladding boards and the branches are not impregnated with a special insulating varnish, the resin leakage is observed. The defect is eliminated by removing these resins and varnishing. If a dark color is used, the twigs are impregnated twice. This is especially important on the south side, as dark tones attract more heat and the resin starts to flow more easily. When fixing the trim boards, galvanized nails must be used or they must be thoroughly primed. Otherwise, reddish-brown rust stains tend to appear on the painted surface later. Nails are cleaned by sanding, then priming. The surface is completely or partially repainted.

The correct technological sequence of work is also important, because the paint can crack if you hurry to apply the second layer before it dries. If the alkyd or oil paint is left in a layer that is too thick and are still exposed to sunlight, or if the new layer is applied on an undried coat, an uneven, wrinkled surface may form.

The defect is repaired by removing the damaged layer with a scraper or sanding and then repainting. The wet edge of the paint must always be observed during the work. Otherwise, a darker tone or higher gloss may appear at the joints. To prevent this from happening, continue painting until the transition is dry. This is possible by periodically transferring the paint to the uncoated area and then back to the freshly painted area. This technique, when going from wet to dry, gives a smooth, even coating. It should be remembered that when painting a wooden facade, one board moves forward. Approximately 1.5 m2 is immediately taken for the masonry surface. Breaks at work are planned at the window, door or in the corners. If new plaster is to be painted, first wait until it is completely dry, at least 1-2 months, because fresh masonry surfaces are strongly alkaline, and paints do not like such an environment. If the plaster has not yet hardened, the color tone can fade quickly and even the entire layer may come off. The alkalinity of the plaster decreases over time.

If the paint is painted in too windy, if the paint has been too diluted or the surface is poorly prepared, cracking of the paint, which ends in peeling, is also possible. The oil paint peels when applied to a wet surface. Blisters occur when dew or wall moisture gets on the paint of a water dispersion. Damage is repaired by completely removing the paint with a scraper, sandpaper or a hot air dryer. Then the surface is primed and painted. If moisture seeps through the wall, the cause must first be determined and remedied.

If the surface is painted moldy, black or brown stains may appear. They are removed by washing with anti-mold agent and rinsing. Then treat with a wood preservative and repaint. If the paint is not resistant to UV radiation, it slowly starts to fade on the south side. To avoid this, colors can only be tinted with pigments from a special tone card. If the salt layer on the masonry surface is not removed before painting, they also continue to seep and salt stains appear. First, eliminate the cause of moisture, for example, repair the roof or install a fan in the bathroom, then rub off the salt layer with a wire brush, wash and paint. If dark paints are used, in which chalk is the filler, frost – salt – like substance may appear on the surface in closed places. Defects are repaired just like salt stains. If low-quality matt paint is used, air pollution and dust on the façade will cause it to stain, which is similar in appearance to mold. Can be helped by washing the dirt with water or washing solution. It should be remembered that less high-quality paints with a higher degree of gloss are smeared.

Important

• Blisters occur if the paint does not adhere well to the substrate. This often happens if the surface has been heated, so it is better not to paint in bright sun, but to do it in the evening.

• Cloudy, cool weather without wind is suitable for painting the facade. It is not recommended to start work if it is expected to rain or too late in the evening, because the paint does not manage to dry before rain or dew.

• Before painting, the surface must be well cleaned and properly prepared, it must not be dusty. Only suitable exterior paints are used for the facade, and the first layer is allowed to dry long enough.

• If a new galvanized surface is not matted, the paint will not adhere well to it, so it must first be primed with metal primer and then to paint with the usual alkyd paint. All glossy surfaces can be made rougher with sandpaper for better adhesion.