Why do brush lines sometimes appear when painting by hand, and how to prevent them?

After the paint film dries, uneven brush lines will appear, which will affect the smoothness and gloss of the paint surface. The reason for the brush marks on the paint film is that the paint is too thick, dries too quickly and has poor leveling properties. The paint cannot be opened or it is not as good as the leveling after brushing, then it dries and no longer flows. After the paint film is hard, the paint still remains. past lines and traces. In addition, there are too many pigments in the paint or partial condensation of the pigments; the paint bucket is not sealed, and the solvent in the paint volatilizes in a large amount without being properly replenished, which makes the paint liquid change. When painting and brushing, if the area is too large, the paintbrush is too small If the bristles are too hard, the situation that the brush cannot be opened is even more serious; if the bottom surface is too absorbent, the paint will be absorbed immediately after brushing, which will also cause difficulty in brushing and appear brush marks.

In order to prevent brush marks, a thinner can be added to the paint properly. Adjust the consistency of the paint; the area of ​​oiling should not be too large; the brush should be selected properly and not too soft; first brush a primer on the bottom layer with strong absorption; the construction temperature should generally be above 1o ℃; choose a solvent that evaporates slowly or thinner.