I have recently started removing wallpaper from three bedrooms in preparation to paint. I realise I will need to fill the gaps but I'm wondering if someone could give me some advice about the flaky (I guess, Primer) paint that was underneath the wallpaper.
Do I need to sand back all of the paint or just the areas where the paint is flaky?
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Let me tag @Peggers , author of How to paint like a professional, to see if he might like to kick off this discussion and share how he would tackle this project. Typically you would just need to keep sanding back until you have a stable (and smooth) surface to apply a new coat of paint.
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@Jason Thanks for tagging me Jason. I agree, you just need to get the surface smooth, not necessarily get rid of all previous coats.
@tmoyn Thanks for posting such good pics - makes it far easier when helping someone. If it was me, then I'd just sand the edges of the flaky paint with a fine grade sandpaper until the edges are feathered in with the bare walls. So that there are still patches of different colour, but you can't see any defined edges - and when you run your finger over it, it feels smooth. When you paint over something, it's always the edges or cracks that are most noticeable. In that respect, I wouldn't get rid of all of that paint.
My only caveat would be to maybe gently sand some of the other areas you suspect might be susceptible to flaking. Just smooth your hand over large areas and see if there feels any give in the paper or looseness. While you don't necessarily need to get rid of it all, it's a killer if it starts flaking when you're in the middle of painting new coats. Go in with the mindset that you don't need to get rid of it, but you'll get a sense of whether that's possible when you start trying to blend in areas with fine sanding.
Be interested to see how it goes - good luck!
It's great to see you've already received some solid advice from @Peggers.
The only thing I could add is that you might be best starting with a Trojan 6 In1 Multi Paint Scraper and really giving the flaking areas a good go over. This will reveal those loose and deteriorated areas where the paint will potentially let go later on. Do the same to any cracks or areas that look a bit unusual. Follow that up with the sanding technique mentioned above. I'd also agree that if you can't feel the transition with your fingers, then it is a good indication paint will cover it.
Once everything is sound and sanded smooth, fill any larger cracks or deformities and sand back the filler. Apply a product like British Paints White 4 In 1 Prep Water Based Primer Sealer Undercoat to ensure everything is ready for paint.
Please let us know if you need further help or had questions.
Thank you all @tmoyn, for posting your initial post and @MitchellMc, @Peggers for the great advice. I too have recently removed wallpaper, and in some sections it has removed some of the paint. While I intend on replacing it with new wallpaper to create a different look and feel to the room, should I also smooth over the areas where the paint has come off to ensure the new wallpaper goes on smoothly? The new wallpaper requires the adhesive to be applied to the wall first.
I would smooth it over to be safe. I will have to skim coat my loungeroom before I repaint it as where the feature wall wallpaper is coming off it is fairly rough.
@NickiM good to see you're using wallpaper. I posted a discussion recently asking Does Anyone Still Use Wallpaper? I've had some good results using it. The great thing about it - as well as the designs - is that it does tend to help cover any imperfections. I'd agree with @Brad that it's worth trying to get the area you're pasting onto as flat and smooth as possible, but wallpaper isn't going to show up any imperfections as starkly as painting would. It doesn't have to be perfect, just as smooth and flat as you can get it.