![]() ![]() When used as a finish coat, California One-Kote may be painted. California One-Kote is designed for a 'one coat' application up to ¾” of an inch thick in one pass. ![]() Building one the entire width of the room is more traditional.California One-Kote is a gypsum-based, quick-setting, patching plaster for repair and renovation of gypsum plaster wall systems. I bought a neat little rolling mason's scaffold from Harbor Freight. Except for small repairs, working from a ladder is impractical. Two hawks and a helper to keep them full speeds things up. With any plaster, you load it on a hawk, place the hawk with one edge against the wall, cut off some plaster with your trowel and spread it diagonally across the lath. If I haven't said this before, don't use UNSLAKED lime. Both lime and gypsum take wet troweling you brush the wall with water before troweling it to take out the cracks. I don't know for sure that lime plaster will stick to Structo-lite. A plastic face mask is also good, but I don't use one, except when plastering ceilings. You'll want to wash your clothes at the end of the day, so a work coverall might be a good idea. If getting it on your skin makes it red or itchy, wash the area with dilute vinegar (and be more careful next time). Some people are sensitive to the alkalinity of the lime. I think it's easier to make a good plaster wall than a good drywall one. Lime plastering is fun and hard work, but pretty easy to learn by doing it. After you get a little experience, you can tell what's too stiff or too runny. bags, mix it to a stiff paste with water (in a mortar tray or cement mixer), and add 3 parts by volume of mason's sand (again, mixed well) to make ordinary plaster. You buy the slaked lime (calcium hydroxide) in 50-lb. If the old plaster is loose, remove it when the keys are broken, new plaster on the edges won't hold it in place. It is advisable to moisten the edge of old sound plaster that you're working up to. I suppose Plaster Weld would fix that problem, but I don't think it is necessary. The reason to moisten old dry lath is so they don't suck water out of the new plaster when it is applied, leaving a dry powdery layer with no adhesion. I don't see why it wouldn't hold as well as any other gypsum plaster. It is also specifically recommended by the manufacturer for wire lath or veneer (rock lath) application, so they don't guarantee its use on wood lath. The problem with aggregates (pebbles) in plaster is that it is difficult to make a smooth finish with the standard 1/8th inch skim coat. Structo-lite is a perlite aggregate gypsum plaster. I've never used Structo-lite or Plaster Weld, so I have no first-hand information on them. The commercial pre-mixed products are a waste of money. Or, like I did in my kitchen, you leave them and call it "rustic". You take out the trowel marks by wet brushing. What makes a good job of lime plastering is repeated and strong troweling. Lime paste is inexpensive, easy to make, readily available (every building supply store carries calcium hydroxide), and simple to use. ![]() Green two-coat was the standard residential work in the old days, where the brown coat was immediately applied over the scratch coat (which, being still wet, was not scratched). Three-coat work mainly exists in manuals on the subject. Make sure you do the wiring first, while you can see into the wall and cut out lath where necessary. You will probably have to spray them with water several times over several days before starting, until they do not take up any more moisture. If you are re-using old lath, make sure they are not dry before plastering over them. I would use joint compound for filling cracks, but not as a base or skim coat. Modern plastering is done with gypsum plaster over rock lath, which is a form of sheetrock. I would expect Red Top gypsum plaster to last as long as lime plaster. In my house I have found it (Durabond) cracking and peeling from the old plaster after thirty years. Joint compound is gypsum with retarders to keep it from setting up fast like plaster of paris. Wire lath is malicious and wants to slice your hand and face. A half-inch of plaster over it will be much stronger than drywall. Wire lath over wood lath has the same fire hazard. ![]() There is also the fact that old plaster is 3/4 inch thick, so you have to use 1/2 inch drywall, which makes a crappy thin wall. Have you ever seen hundred-year-old lath burn? We used to carry them for firestarters on camping trips. ![]()
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