Here is A CPM Guide to Plastering a wall from the team at CPM Exeter, for all you DIY’ers or apprentices. Check out the 6 Things you need to do and consider when plastering a wall.

Plastering a wall a quick guide from CPM Exeter.

1. Clean & Prep your surfaces!

Plaster won’t stick to just any surface, and you don’t want it to start falling away, so ensure your surface is ready to be coated. Therefore make sure it is clean – remove bits of existing plaster, dust or wallpaper.

2. Check your surface – Check the plaster will stick!

High suction porous backgrounds can suck the moisture from the plaster meaning it dries too quick. To resolve this, you may need to dampen the wall before you start plastering.
The best way to do this is to use a fine mist spray gun. Plasterboard or backing coat can be skimmed over without preparation.

3. Mixing

Always mix plaster by adding plaster to the water and not the other way around. Add just enough plaster first to make a heap on the top of the water and mix it so that it’s lump-free, then slowly add the plaster to get the correct consistency either with a wooden stick or mixer drill.

Plaster and water mix roughly half and half – so half a (clean) bucket of water should make a full bucket of plaster. The plaster should be the consistency of melted ice cream – try standing a stick in it – if it can stand up, the plaster is mixed right.

4. Applying the Plaster

When plastering a room, do alternate walls that do not touch as you risk damaging one wall while plastering the other. Keep the room cool; radiators should be turned off, or the plaster will dry out too quickly, making it difficult to apply and crack.

A good plaster finish can be achieved with a combination of positive firm pressure and the correct angle of your trowel. As the plaster on your trowel gets less and less with your movement, the angle between your tool and the surface gets smaller.

Don’t get plaster in your eye! Remember not to stand directly under the trowel.
You don’t need to worry too much about smoothness or trowel marks at this stage, just that it’s flat and even. Make sure the first thin coat is wet and pliable when you apply the second coat.
After the first two coats, the ‘trowelling up’ process begins. This is time to fill all those holes, remove your trowel marks and get it smooth.

Make sure before you start the plaster is tacky – pliable enough to push the plaster into the holes, but not so wet you make new holes. Don’t over polish the plaster on the final dry trowel stage – it should be even and slightly polished, but feel like an eggshell – any smoother, it makes paint and wallpaper a nightmare to stick to.

For beginners, a good size to start with is 11 inches. While a larger trowels cover areas faster, it’s harder to control. When plastering an old trowel is much easier to use this way – some can be bought pre-worn.

5. Clean up the surface

Then when the plaster is quite firm, any trowel marks and ridges will be successfully smoothed out providing you have kept it flat allowing your trowel to sit flat on the wall.

6. Keep your tools clean!!

Sounds over the top but it’s vital to have clean buckets, tools and equipment to ensure your plaster doesn’t go off and you get a better finish that lasts, dry plaster is a nightmare to remove from your tools and can cause drags in the plaster finish on your next job!

Still want to know more, why not check out this video from ‘Pouse around the House’ From Youtube


Or Click here to view on YouTube


CPM Exeter has a team of plastering and wall boarding specialists working across Devon. We are more than happy to visit your property and see what sort of work is needed. Our specialists will provide a free quotation and expert advice.

So, is there anything you don’t do? No. We do it all.

If you require our services for any plastering or wallboarding, then contact our helpful office manager Donna on 01392 925 045 or give us an email enquiries@cpmonline.co.uk. And we will be able to book a suitable date and time for your quotation. Contact us today for your FREE Same Day Quotation.

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