While I am not new to painting I am new to the new techniques of painting. My wife and I are closing on our first house next month. Our problem is the present owners painted the living room a light pink base with a dark pink sponge technique. Looking at the walls they are no large ridges but I can see a slight height difference in the paints and am worried about these patterns showing through after priming and painting. Has anyone painted over walls with this treatment and was there a noticable pattern if you didn't sand? I would rather not sand if possible but want to do this painting once and not have to worry for many years.
Paint does a horrible job of hiding texture defects. I would not try to "get away" with not smoothing if I were in your place.
There are three options:
1) Sanding. Use of a "drywall screen" could work here.
2) Skim coating with an extremely thin coat of joint compound; which is then sanded and primed.
3) Hi-build primer, which is then sanded.