Primer is a coating directly applied to the surface of the construction object. It is the basic material on the surface of the workpiece. It is not only the material in the middle of the putty layer, but also the material for the connection between the primer and the topcoat. The primer can be divided into first primer, first primer, second primer, surface seal primer, etc. according to different purposes.
(1) Primer primer
The pigment content is the lowest, the filling performance is weak, it has strong adhesion, and it is difficult to be sanded by sandpaper.
(2) Primer for first and second application
The pigment content is more than the first road primer, relatively speaking, the adhesive content is less, the adhesion is not as strong as the first road primer, but has strong filling properties, often used as a separate primer, can also be used as a head Road primer.
(3) Two primers
With the highest pigment content, its function is to fill pinholes, fine eyes, etc., with good sandability.
(4) Surface sealing primer
The pigment-containing component is relatively low and is mainly used to fill up the grinding marks, provide maximum smoothness to the topcoat, make the topcoat plump, and prevent the occurrence of gloss, spots, etc
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