Answer for Is it necessary to use a primer to before covering a semi-gloss latex paint with a flat latex paint?

If the painter who paints the wall knows what he's doing, a primer is really not required… but careful rolling is required and to be sure a "wash coat" using the finish coat paint, could be applied first, which would act as a primer… then when dry (1hr) a finish coat carefully rolled will do the trick… all of this assumes that a High Quality Paint is being used (often not the case with apt repainting)…

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Answer for Is it necessary to use a primer to before covering a semi-gloss latex paint with a flat latex paint?

A primer is only needed if you used an oil base and they use latex. Latex won't stick to oil without a primer.

It is possible they needed two coats because the first coat slid around a little when applied over the slick semi-gloss, this is also called a prime coat. This would cause insufficient coverage on the first coat. It wouldn't affect adhesion of the first coat.

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