1. Bubble:

Phenomenon: There are bubbles in the paint film.

Cause: The paint forms air or solvent volatilized gas during the construction process to cause bubbles, improper treatment of the substrate (such as high moisture content of wood, unsealed pores or water on the surface of the substrate, etc.) or improper brushing during construction (paint This phenomenon is likely to occur when the film is too thick, etc.

Treatment method: The surface of the substrate should be cleaned, and the moisture content of the substrate should not be too high. If there is water on the surface of the substrate, wait for the water stains to dry before applying paint. If air bubbles have occurred, use a spatula to shovel away the air bubbles and re-sand and paint.

2. Pinhole:

Phenomenon: There are pores similar to acupuncture in the paint film.

Causes: due to the rupture of air bubbles mixed in the wet paint film and other generated bubbles, and the failure of leveling before the paint film is dry, or due to improper handling of the substrate or improper construction and brushing (the paint film is too thick, etc.) cause. When the latex paint is applied by roller, if the brush is too thick or the roller rotates too fast, pinholes are also prone to occur.

Treatment method: If the paint is sanded, fill it with putty, and then brush it once or twice. After the varnish is polished, brush it a few times to allow the paint to penetrate into the pores and fill it up. For latex paint, pay attention to the construction method, and you can apply it thinly where there is a problem.

3. Wrinkling:

Phenomenon: The paint film presents wrinkles in the form of regular small-amplitude corrugations, sometimes reaching part or all of the film thickness.

Cause: One brush is too thick during construction, or the ambient temperature is high, the surface of the paint film dries quickly, but the inside is not dry, so it wrinkles. When the first layer of paint is not dry, apply the second layer; improper paint ratio or improper dilution is also easy to produce

Treatment method: Use a shovel to shovel off the wrinkled part, and then grind it with coarse sand to level it up one to two times as normal. Remember to wait until the first layer of paint is completely dry before applying the second layer, but it should not be applied too thickly.

4. Cracks:

Phenomenon: There is a discontinuous appearance on the surface of the paint film, which not only produces cracks, but in severe cases, the cracks can penetrate the coating, resulting in the complete destruction of the paint film.

Cause: The construction is too thick, and the thinner is added too little for thick coating. The thicker the coating, the more severe the cracking, which is common in nitro-lacquers.

Treatment method: Nitro-lacquer can be scrubbed evenly with strong solvent, and then brushed several times in thin layer.

5. Whitening:

Phenomenon: The phenomenon of milky white appears on the paint film.

Cause: Moisture in the air condenses on the surface of the wet paint film, which mostly occurs in paints that dry faster and when the air humidity on the construction site is high.

Treatment method: nitro paint can be scrubbed with thinner, or when the air is wet in the paint, add white water, other paints, especially matte, avoid thick coating in wet weather, if the paint film appears white, only paint Remove and rebuild.