For this I'd use polyurethane* which has good scratch-resistance. In addition, sealers keep mould and mildew from forming on the wood's surface. Nick Davis is a freelance writer specializing in technical, travel and entertainment articles. For plywood edge sealing I glue on a 3/8" x 3/4" strip of wood using Titebond 3 (waterproof) glue to the edge to band it. The CPES was then allowed to cure once more, and the sections were cut and sanded as above. To keep exterior plywood from rotting, it is important to seal the wood with a water-repellent sealer that also prevents the wood from peeling. Waterproofing Plywood. Use a small stain brush to apply the varnish to the plywood. The dyed regions are far smaller than before. The very name of Marine Plywood immediately gets you thinking about how perfect the product will be for use in water our outdoors in general, and the promise of it being an exterior plywood plays up that idea too. Step 1 Seal the edges of the plywood after it has been cut to shape with a water-repellent preservative. Plywood is an important and stable building material, comprised of many different veneers glued together at right angles. The goal is not to sand the filler away but to even it out and fill … This explains why sound wood treated with Clear Penetrating Epoxy Sealer resists rot so very well. Meet The Chemist Behind The Technology, Seal Timber House Frame To Solve Mould Problems, Timber Joint Sealing: How To Repair Cracks or Joints In Exterior Timber. The material, like other wood, is not resistant to moisture and other weather elements when used outdoors. How To Glue And Repair Wood With Epoxy Wood Glue, Metal Glue Tips: Preparing Metals For Gluing Or Painting, Plastic Glue Tips: Preparing Plastics For Gluing, Render Crack Repair: How To Repair Cracks In Rendered (or Stucco) Walls Permanently, Precast Concrete Panel Repair – Repair broken cast concrete. Fiberboard is an insulating structural sheathing made up … These areas of Medium-density fiberboard, or MDF, is a … House Painting Info: Professional exterior painting tips. Dip your foam brush or roller into the sealant. Start by sanding the surface lightly, just enough to rough up the existing sealer … Sealing Plywood for longer life. The glue in good exterior ply is resorcinol resin, same as marine ply. These boards are normally used for extreme duty exterior applications like trailer floors. Apply it to the wood, starting with the top and side edges and moving to the front face. Make sure you’re using an exterior-grade plywood (B-C grade should work, or marine-grade) to start with, which will be made with water-resistant glue. How to Stain Wood for even colour or to accentuate grain, Penetrating Epoxy. These sheets were first saturated with Smiths CPES – which is naturally clear. Smiths CPES does not attack the phenolic surface of such boards, varnish finishes which last up to 20 years. Check here to know the best way to seal MDF and what products to use. Allow the epoxy to … These layers provide dimensional stability, but leave the edges, which expose all of the laminate sections, particularly vulnerable to water damage. plywood, and clearly demonstrate areas of abnormal porosity (areas that Buy some Bondo®-type auto body filler or wood filler and spread a thin coat on the plywood edges, then sand it smooth. Plywood is a flexible wood material used in the construction of houses, sheds and other buildings. The results are astonishing, and demonstrate how well CPES acts as a waterproofing preservative on plywood. If sealing a large piece of flat exterior plywood, use a paint roller to apply the sealer to the flat areas and a paintbrush to apply it to the edges. 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