我是否需要打磨舊的透明塗層以為新塗料塗底漆?


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所以我做了很糟糕的嘗試,試圖將車門上的油漆(車門上的舊油漆剝落)與其餘的汽車相匹配,我想對整輛汽車重新上漆以具有相同的顏色。濕式打磨將是一個漫長的骯髒過程,因此我想知道是否可以在已經具有幾層透明塗層的舊油漆上再塗新的底漆。底漆會粘附在透明塗層上還是會在一段時間後剝離?

我的意思是,理論上說,用砂紙打磨是因為它可以通過其粗糙度增加接觸表面的厚度,但是我不確定我是否正確理解了底漆是否能像這樣工作,或者它只是粘在被塗的表面上通過某種化學鍵或其他方式。誰能幫我這個?謝謝!

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I'm not a body man, however, I do know one thing about it: you get out of the pain what you put into it. The largest part of any paint job is the preparation ... I mean, like 80% preparation and 20% painting. If you do a crap job of preparation, you'll get a crap paint job out of it. If you're not willing to put in the time to do the job right, pay someone to do it for you.

Secondly, you're thinking is wrong about paint being a chemical bond. Primer doesn't work that way. There's a mechanical bond between the paint and the painted surfaces. In order to get paint to stick, there needs to be an amount of texture there so the paint and/or primer can have something to hold on to. If the surface is completely smooth, it will just peel right off. Even with subsequent coats of paint, you cannot let the previous coat dry too much, or the next layer won't stick to it. There has to be someway for the next coat to adhere to the previous coat. Without it the paint won't stick correclty and you'll get a crap paint job.