Once the wall are done you will then have to use a corner trowel and apply a coat to the corners for a consistent finish. Give the final coat a full day to dry, then you'll sand the drywall for that ultra smooth finish.
The answer to ur question is the quality of finish on the skimming. When painting onto new plaster, it's generally recommended to sand the walls lightly before painting. Sanding helps smooth out any imperfections in the plaster and provides a better surface for the paint to adhere to.
Go over wall with 150 grit paper, to smooth down any rough areas, apply one mist coat, any further imperfections will show up, so fill & rub down any areas where needed, then apply a second mist coat, then your top coat(s),second one if needed.
Skipping the prep before painting your walls can mean you're left with an uneven finish, unsightly paint bubbles and obvious imperfections, such as holes and cracks. Taking the time to prep before you roll paint onto a wall helps you achieve a flawless finish that stays that way for years to come.
In most cases, professional painters don't wash walls with a detergent solution to avoid damaging the drywall or trim. Instead, most professional painters lightly sand or “scuff” the walls with a pole sander using fine-grit sandpaper.
Skipping the sanding step can make it challenging to achieve a professional-looking finish on your cabinets. Sanding helps create a smooth surface, allowing the paint to glide on more effortlessly and evenly. Without this preparation, you may encounter difficulties in achieving a consistent and polished appearance.
Don't paint directly over new plaster walls because the glossy surface can prevent the paint from adhering effectively.
Give the final coat a full day to dry, then you'll sand the drywall for that ultra smooth finish. In color, it may not look perfectly even, but as long as it's super smooth, the primer will do the trick to even the color prior to paint.
Ideally, you should wait up to 4 weeks for plaster to fully dry before painting.
Due to the fact that newly plastered walls cannot be painted using certain paints until they are completely dry, contract matt is the best paint to use. This is for a number of reasons, which include cost and moisture.
If the paint is in good condition and not in need of any maintenance, it is perfectly fine to skim over it with plaster. However, if the paint is old, flaking, or damaged, it is recommended to remove it before plastering.
Allow the first coat of BASF LEVELING SKIMCOAT to partially cure, then sand the skim coat with 100-150 grit sandpaper to remove trowel marks and create a smooth surface.
If you've plastered yourself, or if you can see a few spots and bumps (which could be a splash of PVA or plaster), you can lightly sand these back to avoid them showing up once you've painted. Overly sanding the surface will create additional shine, not ideal for adhesion when you start to apply the paint.
A disadvantage of skim coating is that the skim coat is very thin and fragile. Be careful when priming and painting the skimmed wall. Is sanding necessary before skim coating? Sanding before skim coating may be necessary if the wall is glossy or if rough areas need to be smoothed down.
Start by Prepping the Walls
Roll a fast-drying, stain-sealing drywall primer on the walls. The primer seals loose paper and promotes better adhesion of the joint compound. These are thin layers that won't fix holes or torn-away paper, or make uneven sections level. Patch these problems with setting-type joint compound.
There are two ways to do the second coat: Do exactly what you did on the first coat—simply repeat with the easier sanding all purpose compound. Cross-apply the compound.
MAKE SURE YOUR WALLS ARE COMPLETELY DRY. This can take a maximum of 7-10 days, depending on the conditions in your home.
Painting a newly plastered or skimmed wall requires more preparation than painting an ordinary wall. The plaster will first need to be sealed using a mist coat, which is essentially watered-down emulsion paint that acts as a primer.
You can get by with sanding only the areas that have been patched, but walls look much better after painting when you very lightly sand the entire wall. The point is to get rid of any little imperfections, not to remove roller texture, so this is a quick sanding. Use a sanding sponge with 100-grit sandpaper.
The Golden Rule of Sanding
The golden rule for choosing your sequence is to never skip more than 1 grit. For example, if you start with P80, and need to finish at P240, rather than using every grit from P80 – P220, you can do P80 – P120 – P180 – P240. This sequence cuts out P100, P150 and P220.
However, generally speaking, if the first coat you apply is about perfect and there are no visible defects anywhere, then sanding may not be necessary if a second coat is applied right after the first one has dried. But once the first coat has fully cured, a second coat may not adhere as well as one would like.
Yes, you can, but there's a catch. If the furniture doesn't have wax on top feel free to start painting. But most chalk-painted pieces will be sealed with a wax topcoat. Now you don't have to sand, but you “have to” remove the wax.