Painting over bright color with Kilz and single-coat of one-coat paint: overkill? Underkill

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We are expecting to close on a new house Friday, and my out-of-state father-in-law will be there for the weekend only to help us paint a couple of bedrooms. The rooms are bright colors now, and we want to replace the bright colors with a light gray on the wall and a white on the wainscoting. We intend to use a coat of Kilz primer, and he is recommending we use an expensive one-coat paint (Behr Marquee) on top of it. Will a single coat probably suffice? Is it overkill to use an expensive paint+primer on top of a primer?

We will be painting with semi-gloss, and I believe that is what is on the walls already.

Best Answer

I've used the higher end paint+primers from both big orange (Behr) and big blue (Valspar), and found that they cover very well in a single coat. You may have to do a second touch-up coat; especially where you've cut it with a brush, but they cover well in the first coat.

If you're doing any patching, or have new drywall or joint compound to cover, you'll want to use a primer first. Otherwise you may be able to skip the primer.