After 1-2 days of varnish construction, or several weeks later, the whole or part of the paint film surface is covered with a layer of misty fine particles similar to plums when they are ripe. Frost". The reason is that there is smoke, gas, and moisture in the environment, especially the stronger the water resistance of the varnish, the greater the possibility of "whitening" in a humid environment; the addition of cobalt-containing drier to alkyd paint is the easiest "Blooming", while the calcium-containing drier can inhibit "blooming". The solvent evaporates too fast, which is also easy to cause this phenomenon.
Prevention methods: one is to prevent moisture, smoke and coal gas; the other is to avoid the use of cobalt driers.
