Skimming (or skim-coating) a wall before wallpapering is essential to achieve a flawless finish, especially if you are dealing with previously textured walls, deep cracks, or gouges. It creates a smooth, uniform surface that allows the wallpaper to adhere properly.
The wallpaper will not adhere properly to a rough base and because the wall is rough the wallpaper will not look good. You'll want a proper smooth wall before you apply any wallpaper, have a professional float the walls. SKim necessary.
For most beginners, a medium-sized firm steel trowel is a good all-round skimming trowel choice. It is large enough to cover ground, but not so big that it feels unwieldy.
One of the most significant drawbacks of skim coating is the time investment required. It's not a quick fix. The process involves several stages, each demanding careful attention and drying time: Preparation: Cleaning the surface, repairing major damage, and taping.
Apply Joint Compound (Skim Coating)
Apply a thin, even layer of joint compound to your walls using a large drywall knife or trowel. For most walls, you'll want to achieve a thickness of about ⅛ of an inch. Use smooth, long strokes for even coverage, and avoid putting too much product on the knife at once.
Load a small amount of product onto your trowel or Skimming Blade, and start in the top corner of the wall, working across in small sections. Aim to apply a thin, even layer—roughly 1–2mm thick. Don't worry if it's not perfect at this stage. It's totally normal for your first coat to look a little rough or patchy.
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Skim coating can last for about a decade. But they will need constant repair and renovation. Although the task is a tedious one with a lot of time required, if done without a single error the restoration can make the walls look all good as new again.
Improvement: Skimming enhances the appearance of existing plaster or drywall, making it an excellent choice for refreshing old walls or fixing minor imperfections. It prepares surfaces for painting, wallpapering, or other decorative treatments, ensuring the final finish looks neat and durable.
How We Skim Coat
Applying the Skim Coat
Start from the Top: Begin applying plaster at the top of the wall, working your way down to ensure even coverage. Even Application: Use the trowel to spread the plaster in a smooth, even layer, applying consistent pressure to avoid uneven spots.
Things to focus on while skimming:
Do I Need Primer After Skim Coating? Yes—A skim coat smooths damaged, textured, or uneven walls using joint compound before priming. Primer seals porous surfaces like new drywall or skim-coated walls and improves paint adhesion.
New walls must be thoroughly cured, dry and primed. For previously painted walls fill cracks or holes with patching paste, then sand smooth. Spot-prime the patches and prime all walls to be papered. For walls with old wallpaper remove, patch, sand and clean.
Small-scale florals, ditsy prints, and delicate motifs are all about subtlety and timeless charm. In 2026, these patterns continue to offer a gentle alternative to bolder designs, bringing a sense of calm, intimacy, and refinement to a space.
Common mistakes in this step are not cleaning the surface properly, not removing dust or old paint, and ignoring cracks and holes. Before you start on a plastering job, you have to make sure that the surfaces you're working on are thoroughly clean. This is to make sure that the plaster adheres properly to the surface.
Skimming a wall may seem daunting, but with the right tools, materials, and technique, it's a job that can be done by beginners with some practice. A well-skimmed wall provides a perfect base for painting or wallpapering and can dramatically improve the look of any room.
Be sure that the surface is clean and damp before applying skim coat. Dry surface will absorb the water from the skim coat mixture making the skim coat powdery.
You can skim a wall yourself, especially with the beginners method. The traditional method requires more skill.
Advantages and Disadvantages of Skim Coating
The process can be time-consuming and may necessitate multiple coats to achieve the desired effect. Furthermore, without proper application and drying conditions, it is prone to cracking or peeling, necessitating future repairs.
The cost of skim coating walls varies based on room size and wall quality, but the average cost sits around $600, and most projects fall between $300 and $1,200. Skim coating drywall—also known as a level-five drywall finish—gives your walls a nearly perfectly smooth finish.
Cost: Skimming is usually cheaper because it needs fewer materials and less labour.
If your skim coat starts cracking, the most common reason is applying it too thick in one go. Thick layers shrink more as they dry — and that's when cracks appear. The fix? Apply two thinner coats instead of one heavy one.
The single most critical step after skim coating is allowing the plaster to dry completely. This isn't a quick process, and trying to rush it will undoubtedly lead to problems down the line. Wet plaster can cause paint to discolour, bubble, or simply not adhere properly.
Cement can cover an area of 9.39m2/hr in smooth plastering while skim coat is 6.46m2/hr. In painting, Skim coat can cover 9.40m2/hr while cement is 5.14m2/hr. In terms of quality, the output of skim coat is more pleasing compared to cement. Based in cost analysis, skim coat is more expensive than cement.