The functions of primer and topcoat
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May I ask: Both the inner and outer surfaces of steel structures or chimneys are generally coated with a primer and a topcoat. What are the respective functions of the primer and the topcoat, and why cannot just one type of paint be used? ? ?
You can look for relevant books to read
The guy upstairs is really fast; could you introduce that material? Is it available?~
First apply the primer as a base, then cover it with the topcoat. Both rust-proof paint and primer can prevent rust and are used as undercoats. The difference between them is that primers contain a higher proportion of pigments and can be sanded; their focus is on providing good adhesion to the surface. In contrast, rust-proof paint is designed to meet requirements such as water resistance and alkali resistance. The topcoat is primarily intended to provide color, prevent slow oxidation, and protect the primer; its concentration is slightly lower than that of the primer, and it gives a brighter finish
Thank you, I seem to understand a bit now. Another question: how is the service life of anti-corrosion paint evaluated? ?
The primer provides rust protection and enhances adhesion; it generally cannot withstand direct sunlight and ages quickly. The topcoat, on the other hand, has strong corrosion resistance and is resistant to aging, and when used together with the primer, it offers strong adhesion.
The primer serves to ensure strong adhesion to the substrate, while the topcoat provides protection against water, seepage, and corrosive substances.
The function of the primer is to fill gaps and increase thickness, as well as to provide other benefits such as rust prevention; in the case of latex paint, it also offers alkali and mildew resistance. The function of the topcoat is decoration and aesthetics; the surface finish also provides wear protection
It sounds like there’s some renovation going on upstairs, right? ? ?
In the paint industry, there is generally a distinction between primer and topcoat. The primer has strong adhesion, while the topcoat is beautiful and smooth.