Paint problems and solutions

First, paint peeling off

One possibility is that the surface is too smooth. If the original paint is lacquer or powder (with untreated sizing paint), the new paint will not stick to the surface. Or it may be wood decay or metal rust, or peeling off due to poor paint quality.

Solution: Small areas of paint can be peeled off, first polished with fine sandpaper, then putty, brushed with primer, and repainted. Exfoliation over a large area must scrape all the paint off and repaint it.

Second, paint foaming

The puncture of the bubble is caused by the presence of water, which means that moisture penetrates underneath or behind the lacquer layer. When the sun is exposed to sunlight and the water evaporates into vapor, the paint is lifted up into a foam. The second case is the water in the bubble, it may be cracking wood, there is a small amount of air, the sun through the sun, the air expands, the paint bulge.

Solution: For the first case of water, you can use a hot air gun to remove the blistering paint, allow the wood to dry naturally, then apply a primer, and then repaint the entire repair surface. In the case of the latter waterless, the foamed paint is first scraped off, and then the resin filler is used to fill the cracks, repaint, or without filler. After the paint is peeled off, the microporous paint is applied directly.

Third, there is a crack

Fine cracks appear on the surface of the paint, mostly due to the use of incompatible paints, and the paint expansion coefficients of the upper and lower paints are different.

Solution: In most cases, the paint must be removed with a chemical paint remover or a hot air gun and then repainted. If the fracture range is not large, then sanding blocks or wet or dry sandpaper can be used to dilute the broken paint. After the surface is smoothed, apply putty, apply a primer, and repaint.

Fourth, produce stains

There are many causes of stain on the paint surface. For example, the water in the latex paint dissolves the material on the wall and the paint is rusted. The wall surface that is rubbed with the steel wool will cause rust spots, and the dark pipe inside the wall will be stained.

Solution: To prevent blemishes, first brush a layer of primer containing **. If stains are present, remove the latex paint from the stain first, then brush the primer with ** and repaint it.

Fifth, lose luster

The reason is that the primer is not applied, or the primer and the inner layer of the paint are not dry, and the light paint is directly applied. As a result, the light paint is absorbed by the wood and loses luster. The poor quality of glossy paint is also a reason.

Solution: Grind the old paint with wet or dry sandpaper, brush the dust, wipe the surface with a clean, damp cloth, and dry the paint again. It is important to pay attention to the fact that paint is applied in very low temperatures and the paint film may lose its luster after it has dried.

6. Dark spots on the surface of painted wood

This situation may be caused by the fact that the wooden knots were not sealed before being painted, and the sun was exposed to the sun, the knots were heated, and the resin leaked from the knots.

Solution: At this time, the paint can be scraped off with a spatula, and then polished with fine sandpaper to expose the knots. The knots are sealed with a sealer and wait until it is dry and then repainted.

Seven, film wrinkling

It is usually caused by the second pass of the first pass of the paint. At this time, the solvent in the lower layer paint will affect the upper layer of the film to make it wrinkle.

Solution: In this case, remove the wrinkled film with chemical amalgam or heating and repaint it. Remember, we must wait until the first time after the paint is dry before we can go on the second pass.

Eight, paint rough

The newly painted surface is rough, usually the paint brush used is not clean or contaminated by the surrounding environment. It is also possible that the paint is mixed with patent leather. It is not precipitated and filtered before use, or it is dusted when the paint is dry.

Solution: In order to prevent these problems from occurring, clean paint brushes and paint buckets must be used. Before using the old paint, be sure to filter it with paint filter paper or clean nylon stockings. In addition, the painted surface should be covered with a cover or cardboard when the paint is dry to prevent dusting. If the paint is rough, after it has dried, use a wet or dry sandpaper to polish it and clean it, then repaint it. Pay special attention to the paint brush must be clean.