Once the base coat is on the wall, however, you can use ready-mix joint compound for the second and third layers. Air-drying mixtures, like ready-mix joint compound, can weaken a paint bond causing the paint and skim-coating to fall away eventually. It is important to use setting-type compound for the first layer or base coat, because it dries by chemical action that will not affect any paint that is on the wall. Consult the package specifications for information on coverage and also to see if the compound can be sanded after it dries - some compounds set rock-hard and cannot be sanded. It is available in 18- or 20-pound bags in powdered form and must be mixed with water. For the first coating, use setting-type compound. Skim-coating is done with drywall compound: a white, pastelike substance that is applied to drywall to cover joints, cracks, and nailheads. You will need to collect your tools and materials first.
SKIM COAT WALLS CRACK
If the walls are firm with perhaps an occasional crack or hole, then you can skim-coat them. The remedy here is not a light surface coating, but replacing the loose sections with drywall.
In this case it is only a matter of time before the plaster cracks and drops off in chunks. If the surface gives under slight pressure, it may mean that the plaster has broken loose from the lath keys behind. Test the condition of the wall first by pushing against it with your fingertips. Skim-coating can rescue a wall with numerous hairline cracks but cannot help a wall if the plaster is loose or unsound. The job, however, is time-consuming it will take three four days to skim-coat the walls of an average-sized room.
It is a matter of troweling on the coating, then spreading it thin with a wide, drywall taping knife. Skim-coating does not require any arcane skills. Skim-coating can also be used to smooth a textured surface. The layers are so thin that even after applying several coats, the total thickness of all the layers together is less than an eighth of an inch. Skim-coating is the technique of applying thin layers of gypsum-based joint compound over the entire surface. The best way to restore the wall surface is by skim-coating it. It sounds exciting.PLASTER walls frequently develop a network of hairline cracks that are too narrow to be filled with patching plaster, yet they cannot be covered with paint. If budget is an issue, you may decide the money could be better spent on custom cabinetry, spectacular plumbing and lighting fixtures, awesome doorknobs and hinges. If money is not a problem, skim coat-you'll love the result. It was VERY hard to tell the repaired/new wall sections from the old ones.Īnd now that furniture is in and rugs are down, etc, we don't even "see" the walls anymore. We painted samples and looked at them at various times of day and night. Contractor said to use matte/flat paint if not skim coating, but I hate the chalky feel. Our walls were not great, but they weren't awful. That is what we did, and then we used an eggshell finish paint and it all looks awesome. Spackle over the holes and repairs of some damages spots may be enough. If the price seems too high, strongly consider if you need the skim coating. Could be less or more, but that's a starting point at least. Just prime and 3 coats Benjamin Moore paint I'd say about 10K for a really good job. I'll guess from the 1350 sq/ft that it is about 5 rooms (2 bdrm, lvgrm, dining, kitchen & 2 baths). I am more familiar with top end finishes and contractors-not the bargains you find from the guy the super works with on weekends. You don't have particularly high ceilings so that will help keep costs down a bit. Many people will tell you how the higher ones are "just outlandish!" Truth is that quality skim coating and painting can be pricey. You are going to get lots of opinions possibly. It is a labor intensive and very messy job. It involves smoothing a thin coat of plaster stuff over the walls and then sanding them to perfection before priming and coating-ideally with 3 coats of paint. If the walls are older and you really want that "perfect" glassy smooth look, then yes, skim coating is what you want.
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