Will primer penetrate old paint, so that I don't have to remove so much of the old job?

I'm refinishing a bathroom. The wall base is either old plaster or drywall, and the last paintjob was LOUSY. The person who did it used a water-based paint, which is peeling badly! I've removed most of the peeling stuff, but am wondering if I need to remove it all, before priming and painting with something more durable, like a latex or an enamel base. Will a primer penetrate the water-based coat, and let the enamel stick?Will primer penetrate old paint, so that I don't have to remove so much of the old job?
It won't exactly penetrate, but it will stick to it very well. Go with Kilz brand. No need to remove all old paint, but be sure to feather/blend the edges of where there is paint and where there is none.Will primer penetrate old paint, so that I don't have to remove so much of the old job?
Unless you want a textured wall you need to remove the old peeling paint. You may be able to get away with doing like 10 coats, but from the sound of it, the old paint job is pretty bad. I would suggest taking the extra time now and making it look right. Get that old paint off and perhaps even get an electric sander to get the surface smooth again. Talk to someone in Lowes or Home Depot about what you are trying to do and they will help.
I agree with your first answer (Lawnboy and Luna), though I don't know what featherbend means, I would guess it means to sand around or all edges of the old paint you couldn't get off so you can't see holes after you finish, (sand to blend).
i think u still have to remove the old paint.. if not all, at least some. i think u have to use sand paper.. not sure though..

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