GARDZ is the best choice. GARDZ must be used prior to the skimcoat and should be used following the skim coat.In your case, it's also the best way to prime and avoid reactivating any residual wallpaper paste. Apply GARDZ on the damaged areas and let dry. Patch or skim coat the damaged areas. Let dry and then sand. Wipe away sanding dust and then prime the entire wall surfaces with GARDZ. After GARDZ is dry, it is ready to be painted. Michael

Yes, you should try to remove as much glue residue as you can, which really shouldn't be hard if the walls are plaster. I like to use a green scrubbie pad to loosen the glue and then a couple rinses with water. You should use Gardz as a primer which will lock down any residual paste that you may have missed.

When I remove wallpaper, I have never been able to do it without gouging the drywall or tearing off some of the drywall cover paper. So I end up patching and skim coating, and that's where the oil based primer comes in. Here is how it was explained to me by the experts on Gardenweb. The mud used to skim coat and patch is water-based, and painting over it with a water based product will cause it to have a slightly different sheen than the non-skim coated wall. To eliminate this, you apply an oil based primer over the skim coat.

Karen: which technique are you doing? Textured wallpaper over old wallpaper? Or one of the others? Rereading my post (after getting some sleep) it reads more like I am asking about texturing with drywall compound (like imitating venetian plaster, or a tuscan stucco look). PLEASE come back and tell me how it went! I have seen the paper bag technique done on home improvement shows. ItÂs actually simpler. Dipping in poly would be very messy and sticky. You adhere the paper with latex glaze or acrylic matte medium. Then cover with the same clear liquid to seal it in before painting. My hesitation with doing that is if someday down the road you didnÂt want such a texture, you could NEVER get it off. The entire room would have to be skimcoated by someone with the skills to get it really flat and smooth. I donÂt think I want to go that route. At least with drywall compound texturing it could be sanded off smooth easily.