2006-09-23 04:55:16 · 6 answers · asked by tones1997 1 in Home & Garden ➔ Decorating & Remodeling
If you don't have peeling, you don't need to scrape or sand.
Oil-based primers can even overcome greasy walls to some extent such as in the kitchen, or soap film in the bathroom, but it would be a good idea to wash them first for better adhesion.
Any primer is supposed to give a better "tooth" for the final finish to adhere to and act as a glue and filler to the existing substrate.
Water based primers do not seal the way that oil-based primers do. They provide the "tooth" but don't block off problems that exist on the underlying wall such as water damage, dirt, grease, or smoke film. Worst case, a water based primer can actually mix with the dirt or smoke and lift it up to the surface of the new paint making the stain harder to cover. This will call for two or more coats of the water based primer to "lock in" all of the underlying stain.
Oil based primers can generally take care of these problems with one coat, covering crayon marks, lipstick, permanent marker, cooking film and smoke and sealing them in and helping with a more even coverage of the finish coat, which is usually a more expensive paint than the primer.
Oil based primers can cause dizziness or nausea while applying and for a short time after, so good ventilation is a must. The only similar problem with water based primers is that some people don't like the smell.
On porous materials, primers help to seal the surface and save money on the amount of expensive finish paint that is used.
2006-09-23 05:22:43 · answer #1 · answered by ebob 6 · 0⤊ 0⤋
Dry clean or wash the semi gloss and let dry prior to the primer coat. When the primer is completely dried, test it by running your palm across the wall in a few places. If you get a powdery residue on your hand, the wall needs a light sanding and wiping down, also if you see rough granulation in the finish. If there's no residue or particles,
go ahead and paint over it. B.
2006-09-23 05:08:49 · answer #2 · answered by Brian M 5 · 0⤊ 0⤋
Honestly I'm one of *those* people who never sanded anything and the only wall I ever primed I painted BRIGHT RED--and was suckered into using a primer...otherwise I never use one and my color turns out just fine--without primer and without multiple coats!
2006-09-23 05:02:50 · answer #3 · answered by Jen-Jen 6 · 0⤊ 0⤋
Any professional will tell you to sand and prime first to acheive the best results. This causes better adhesion and coverage.
2006-09-23 05:05:57 · answer #4 · answered by S G 4 · 0⤊ 0⤋
no. i'd wash the walls first though.
2006-09-23 05:02:17 · answer #5 · answered by practicalwizard 6 · 0⤊ 0⤋
no
2006-09-23 05:02:40 · answer #6 · answered by magan 2 · 0⤊ 0⤋