Priming interior wall repaints

dyier

When is it necessary and when is it not necessary to prime interior walls you are repainting?

Dougit

I've been painting alot of rooms lately and the only time a wall was primed was after a patch had dried. Using drywall compound priming was a must. Because blistering bubbles under new paint would show up if not used over the patch. Using good paint makes a difference. Not using a primer will show new patch work if a Satin or Semi Gloss is used. I Like SW or BM paints the best.

mandisaur

Doesn't it depend on the type of wall it is, too? I was always under the impression drywall should be primed as a rule of thumb, but I'm not aware of how it is for other surfaces.

slickshift

Very rarely
Raw wood and drywall, raw joint compound, mostly found in repairs in re-paints
Sealers may be needed for stains
Oil paints need primer if going over with latex
Glossy paints should have it after sanding...especially in bathrooms
Extreme color changes could be a reason
Mostly problem areas, like a wallpaper removal, or chalky or flaking old paint, those would need a specialty primer

Most basic color re-paints over good condition previous latex paint do not require primer
They need proper prep, which includes cleaning, sanding, and dusting
But not primer