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Wood substrates are required to be structurally sound, flat, dry and securely anchored.  Substrates, such as plywood, hardwood, particleboard, oriented strand board, or other materials, are required to be flooring grade (APA approved) and installed according to manufacturer specifications.  Irregularities, imperfections and joints are required to be properly patched and prepared.  The use of a primer on the substrate will improve bond strength of the patch (Refer to General Requirements > Substrate Preparation > Primers section of this document).