I took down wallpaper in my dining room and it revealed an old paint layer that started to peel off as I scraped off the backing and glue. I'd like to repaint but how to I go about getting rid of the old paint layer? I'm afraid if I just sand it it will divit in spots on the wall and won't be an even finish. Is there something I can paint on after I sand it? I'm not really sure what to do next.
First, make sure you get all (and I do mean all) of the loose paint off the wall. If you get a fairly flexible wallpaper scraper you should be able to bring most of it up. Keep going for that extra 5 minutes after you think you've finished.
Then sand the remaining paint to feather the edges so that they are as smooth as possible.
Next get some filler (spackle I think it's called in the states) and fill in any cracks and large holes. You can also use it over any edges that still seem harsh. When it's dry a light sand will smooth out the imperfections - but don't let it get too dry as it can go very hard.
Finally prime the wall with either a specialist primer or a watered down coat of emulsion. This will also help find any last imperfections. Then the wall is ready to paint.