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DIY fixing plaster...?

5 replies

Kindlynow · 10/11/2021 16:26

Hi, we are removing very old wallpaper and have inadvertently removed some plaster along with it..is this fixable with some premixed plaster and trowel? Any other tips?

DIY fixing plaster...?
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Anon992 · 10/11/2021 16:34

Looks very shallow and like you’ve just removed some of the skim coat?

I’d recommend using Tetrion filler. It’s like polyfiller but much easier to sand. You can order off Amazon.

You’ll also need a flexible filling knife. Screw fix or similar sell them for a few quid.

First pull off any other loose bits. Then spray the whole area with water using a spray bottle (or your iron if you don’t have one!). Mix the filler up on an old bit of laminated work surface or similar until smooth (make a pyramid of powder then make a well in the middle then add water and mix together using the knife - there must be YouTube videos of how to do this, it is very satisfying). Fill the whole as neatly as you can and allow to dry. Sand with sandpaper. Add a second layer if needed.

TwoLeftSocksWithHoles · 10/11/2021 17:34

We had something like that and spread some polyfilla on it, whilst it was still wet we (well maybe not me) sort of wobbled/worked the edge of a piece of wood (wider than the patch) over it to get it pretty much smooth. A bit like levelling a pie.

PigletJohn · 10/11/2021 19:14

wallpaper steamers will do that, the hot steam makes the plaster blow.

I'd use a plasterers trowel, but a broad metal filling knife will do. It has to be wide enough to span across the good plaster on each side of your patch so you can press it smooth.

Use Easyplast or Joint Cement, not filler. You can buy it readimix in a tub but you MUST seal the lid immediately.

Mix it to a clotted-cream consistency or thinner, smooth it on, press it (hard) flat, scrape off any excess. It's OK to have some hollows because you can refill with a second coat. Thick coats will crack as they dry. Your final thin skim can be thin as custard, excess water will be sucked away by the base. You can polish it after it looks set by spraying it with water and rubbing with your flat knife. A filling knife is thin and flexible so will go flat to the wall when you press it. It must be perfectly clean with no scratches or notches or dents.

If you get it wrong, scrape it off with a broad metal scraper (not your filling knife) before it goes hard.

Don't put on excess that has to be sanded off when hard.

BlueMongoose · 10/11/2021 20:32

That readymixed stuff in tubs is ideal for that job. If you're careful, you can get it very smooth and it will only need a little sanding.

Use a broad scraper to get the wet plaster level with the existing plaster.

Kindlynow · 10/11/2021 21:36

Thank you all, will update how we get on!

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