![]() It looks like the wall was already primed properly before they put up the wallpaper. Since joint compound and drywall absorb paint and hold color differently, apply a coat of primer onto the. However it seems that is usually to avoid bubbling which can happen when the drywall paper is ripped. Put a coat of primer on your wall before painting it. I’ve read a few postings saying you should prime the walls after taking down wallpaper and before the skim coat. ![]() Sounds like most folks here like to skim coat the hard way. If, instead, you use a 40/gal 'heavy body' primer marketed specifically for new drywall, you can probably skip the skim coat. I’ve cleaned the wall with warm water and I will probably go over it again with TSP. If the primer youre looking at is the 10/gallon slightly colored water from the home center, youll still need the skim coat. ![]() If water damaged, you could have mold growth behind the wall. The wallpaper came off fairly easily, minimal backing paper residue I needed to remove. Replacing the Drywall If your walls are severely torn open and in terrible condition from water damage, you might consider tearing them out and installing new drywall instead of repairing them. The walls are currently all orange peel texture, including the wall that used to have wallpaper. Should I use oil-based primer on an old plaster wall (as a bonding agent) before skim-coating new plaster over it Stack Exchange Network Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Only one wall had wallpaper on it, the rest are painted. couldn't get a smooth finish on the first passI took some wallpaper down in a bedroom of my house and I want to skim coat the walls to a flat finish. So to answer your question, multiple coats is for people who: The squeegee is more forgiving than a metal trowel. (If there's deeper damage, I'd fix that first by spot patching.) Skip step 1 unless there's much damage to the paper. I use this basic technique, although I only do 1 coat. So the only question is, when the compound dries, will it shrink in those low spots enough so that you need another coat? But before we get into the nitty-gritty, let’s go over the basics. There are 5 crucial things you need to know about this process in order to fully prepare yourself. Don’t avoid it because priming without sanding creates a bubble in the wall during the second coat. I am talking about a skim coat You might have heard about skim coating by now but you might not be familiar with what it is or how it’s done. What you're doing is putting a bunch of compound on the wall, then scraping it off with a flat trowel or knife of some type, leaving behind compound only in the depressions (whether they be holes, gouges, low spots, texture, whatever). Before applying the second coat, sand the first coat of the primer, pick up good-quality sandpaper, and apply it with a mild force. There's not need for an extra layer of material on any areas of the wall that are already flat, and the majority of your wall is already flat. If you’re skim coating over old paint, however, you’re best off priming before you skim coat. It takes longer but will be a lot more forgiving. Buy a bucket of the premixed with the green lid. Don't use the fast drying stuff to skim coat. It'll keep following the bumps on the wall. Don't use a rubber squeegee to skim coat if your hiding texture. The skim coat will stick to the drywall without issues. Always prime over old paint before skim coating. BTW, two coats of Regal Pearl over the Zinsser Dry Wall Primer seemed to allow the intended sheen. Therefore, a coat of Gardz followed by spot patching and priming, followed by two coats of finish seems adequate for a finished product. Even if you could, why would you want to? What you want to do is get a flat wall. You don’t need to prime before skim coating if the surface is fresh drywall. Not necessarily requiring an opaque white. It's not really possible to apply a skim coat of 1/8" over your entire wall. My reaction to that is that you're basically looking at it wrong
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