6 steps to perfect wall prep for a DIY skim coat
Updated: Oct 27
Because getting the wall prep right is important for perfectly skimmed walls
After my budget DIY project to smooth over a textured artex ceiling went viral, I get a lot of questions about DIY skimming to smooth over damaged/imperfect walls, so I thought it would be helpful to show you the steps I go through to prepare a wall for a DIY skim coat. The example below was on a solid wall with some damage to the surface plaster from where some mdf strip panelling had been removed.
Here are my top tips for how to prepare a wall for skimming…
1. Remove wallpaper or panelling
As with most DIY projects, the surface you apply the skim coat to needs to be clean dry and sound and this means all wallpaper, flaky paint and loose plaster needs to go as it will either stop the plaster from sticking or at least cause you a patchy final result.
You don’t have to remove all the paint on a wall if it is in good condition. When I removed the paneling on this wall some of the paint came off around the edges of the paneling strips. I used a palette knife to scrape off any loose bits and paid extra attention to the PVA around the edge or the remaining paint to seal it (more on this below)
2. Remove dust
You can easily brush or hoover away any dust from the surface of the wall and this is essential for good adhesion of the primer.
3. Clean the wall surface
The walls need to be clean because grease and grime can also affect adhesion. Sugar soap comes in a handy spray and is perfect for this job. Just spray it onto the wall or a sponge and rub it over the wall surface.
Don't forget to rinse: rinse off your cleaning agent with clean water & allow to dry.
4. Repair wall damage
Any damage to the walls ie cracks and holes should be patched. Filler is fine for this or for superficial (<3mm deep) damage you can use plaster but you’ll need to apply a bonding agent first (undiluted PVA will be fine or blue grit is good if the patches you are repairing are large). I’m going to do some separate reels on patching & wall repair so feel free to drop any questions in the comments. You can read about how to repair plasterboard/drywall here...
5. Prime the wall
Once the repairs have dried, prime using the diluted PVA mix using my tip for preparation (shake don’t stir). You can see more of that here...
This first coat of PVA needs to fully dry so should be left for at least a few hours, possibly longer.
The second coat of diluted PVA only needs to go tacky so apply it just before you want to start skimming.
6. Protect the rest of the room
Cover the floor & items like radiators. Tape round wall sockets and switches if you haven’t unscrewed and pulled them out temporarily (taping around them works fine for DIY purposes and I don’t encourage messing with electrics - even unscrewing faceplates if you aren’t confident ).
I'm going to be sharing lots more info about the tools & products I use for DIY Skimming, process and tips & tricks for achieving a super smooth finish even when you’ve ended up with a few lines and lumps in the plaster you’ve applied. Here's the link to my main DIY Skimming page where you can find all the resources in one place.
I recently shared a series of reels and stories on Instagram showing the DIY skimming process in more detail which you can watch here…
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