1, the paint should be based on the length of the paint's active period to determine the amount of paint, so how much to use in the active period, the current use, a non-straight welding polyurethane enamelled round copper wire should be too much, and Strictly according to the ratio in the product description.
2. When mixing or painting polyurethane paint, it should not be in contact with water, acid, alkali or alcohol. In particular, the hardener should be sealed after opening and sealing to prevent moisture from entering.
3. Before the finishing, the surface of the substrate should be treated flat and clean, and all kinds of dirt should be removed. The moisture content of the substrate should be appropriate (depending on the equilibrium moisture content of the product area, generally about 2% lower) When the topcoat is made of polyester lacquer, the primer should not be coated with shellac, and nitro, polyurethane and polyvinyl butyral can be used. When using polyurethane as a primer, it must be covered with polyester paint within 5h, otherwise it will affect the adhesion of the film.
4, try to avoid coating the polyurethane paint in the rainy or summer high temperature and high humidity, winter low temperature and high humidity environment, otherwise, the coating film is easy to "white". If it is necessary to finish the application in the above environment, an appropriate amount of PU anti-whitening agent may be added to the lacquer, or the substrate to be coated may be appropriately heated to evaporate water vapor to prevent it.
5, when finishing PU paint, one finish should not be too thick, otherwise it is easy to produce bubble pinholes. The recoating interval should be determined according to the instructions. The interval should not be too long. Otherwise, the cross-linking between the coatings is poor, and the adhesion is reduced. For the cured film, it needs to be sanded with a sandpaper or rubbed with a solvent before painting.
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