Painting - Sanding b4 semi glossing a flat paint?

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dub
06-10-04, 08:56 PM
I have read that when painting a flat paint over a semigloss you need to sand down the old semi gloss layer a little. Does the same apply in reverse? (Don't seem to me it should but what the hell do I know :rolleyes: )

prowallguy
06-11-04, 06:27 AM
It can't hurt, I always do. Sanding also breaks the surface on any grease, or smudge of whatnot that might be on the surface but invisible to the naked eye.
jeffk
06-12-04, 11:16 AM
sanding is unnecessary on flat paint. If something is present that cause poor adhesion (smoke, grease, heavy cigarette smoke) then TSP (tri-sodiumphosphate) will wash away the contaminate. In the case of smoke damage a stain killing primer is used. Fantastic or orange cleaner will fix any small spots of grease etc.