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Cover the entire floor with your APA Rated 3/8-inch plywood underlayment secured with 1 ¼-inch (3d) underlayment nails. Make sure to stagger the joints.Spread a thin layer of leveling compound along the plywood seams with a 6-inch drywall knife. Allow to dry completely (about 30 minutes).Sand the seams smooth with a sanding pad with 100-grit paper.
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