This question has come up a couple times recently in my work. I have
some clients who need stuff repainted that's currently painted with
semigloss paint (latex). I know you need to "scuff up" the surface in
order to get new paint to stick to it.
My question is, is it better to physically scuff the paint with
sandpaper, or to chemically etch it (someone mentioned using TSP in
another thread)? I suppose it may depend on the specific situation, right?
One thing I do know about TSP is that if you use it, you'd better make
damn sure that you remove all of it before you paint, else the paint
won't stick worth a damn.
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