Neither the conditioner nor glue has any odor to speak of, and both wash up with water. Next, inject one full caulk-gun squeeze of the thicker adhesive into each hole, then temporarily clamp the plaster to the lath with drywall screws and big plastic washers.Old plaster will suck this stuff up like a sponge. Then, vacuum out the dust and squirt the conditioner, a milky liquid, into the same holes.Using Big Wally’s is a matter of drilling a series of holes through the plaster on either side of the crack, stopping when you hit the lath.Rory Brennan, a Vermont-based plaster restoration expert, developed Big Wally’s Plaster Magic, a two-part adhesive, to reattach plaster without plaster washers. When the bond breaks, the plaster cracks. The integrity of a plaster surface depends on the bond between the plaster and its wood lath. The finish coat is applied after the brown coat has hardened.The brown coat is applied over wood lath, strips that are nailed to the studs and spaced about ¼-inch apart to create keyways for the brown coat to grip. Old plaster walls and ceilings are made from two layers of plaster.Again, be sure that there aren’t any high spots or ridges left behind. Once dry, apply a second coat of the flexible patching compound in the same manner as the first coat.Ensure that there aren’t any high spots or mounds left behind before allowing the compound to dry for at least two hours. Drag the blade of the putty knife across the crack at an angle (again, not perpendicular). It’s important to remove the excess patching compound as it’s not sandable.Start at the top and work your way down, pushing the compound into the crack. Apply the flexible patching compound to the crack.
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