Combo Member. I've got it all cut to size, but am wondering how to treat it to make it last longer, particularly with respect to the edges. Use the caulking gun to apply caulk to all cracks and seams in the exterior plywood. They will have to tolerate all sorts of weather, and that warrants a change in the way you choose your sealer product. The last one built was before my time and used 5/8 plywood and was still in decent shape until the wind picked it up … You may find the materials for sealing plywood at any hardware or home improvement store. Make sure your paint is outdoor as well. Obviously, these have to be a little bit tougher than the others. Treating Plywood and sealing edges. Plywood is a durable material for projects, but it is necessary to seal plywood to protect it against water damage and rotting, and to ensure a long-lasting finish. Use a knife or a razor blade to cut the tip from the tube of caulk. Allow the exterior plywood surface to dry completely. Wozy68 By Ben + in forum Buy, Sell n Swap Replies: 1 Last Post: 28th Aug 2011, 10:03 PM. Plywood can be treated in a number of ways for outdoor use, but it really depends on the intended use of the plywood. Surface sand, prime and then use a decent exterior wood paint. I am needing to seal it up as best we can such that it will last a long time. Buying A Sealer For Outdoor Use. It worth the extra bucks. Once it is sealed, you may finish your project with paint or polyurethane. Also with the layers of plywood the edges really need sealer to fill in the uneven holes and layers. As you might guess from the title, this article is focused on sealers that are intended for outdoor use. You need an extra strong finish and no leak at all for the wood to keep its initial moisture level. A quart size goes a long way so it's cheaper than spray also. So many home DIY projects involve the use of this type of wood, and in order to give it a finished look, most turn to stain. First method, you want to seal the wood. Plywood is one of the most versatile and cost-effective building materials, and as a result, it is also one of the most popular. What to use to seal exterior Plywood ceiling. If you have pine woodwork or outdoor furniture, applying a finish can protect it from sun or weather damage. I use a water based outdoor polyurethane sealer. I'm restoring an old horse drawn cart, using 18 mm exterior ply. How to Finish Pine for Outdoor Use. Plywood, while a relatively inexpensive product to use, can be particularly tricky when it comes to … There's two different ways to bring up the topic. It is basically a deck, but it will have 3/4 plywood for the floor. If you want your outdoor plywood furniture to last, you should use marine grade ply. Waterproofing Exterior Brick. Insert the tube of caulk into the caulking gun with the tube nozzle pointing away from the trigger. I use outdoor … However, more waterproofing is always a good idea for materials that you're planning to use on outdoor projects. The Best Ways to Paint and Seal Plywood. Cheap 14mm thick Plywood / Plywood Pallets. OSB is said to be more water resistant than plywood by some and not so by others. Discussion in 'Carpenters' Talk' started by Combo, Jun 17, 2008. Don't PVA it, but do make sure you seal the edges very well as this will be key to maximising its performance. After following these steps, you will never risk moisture ruining your work down the road. By skidave in forum Painting Replies: 5 Last Post: 7th Oct 2012, 07:14 PM. The best universal way to treat plywood for outdoor use is with spar urethane, which will make the wood protected from water, sunlight, and temperature changes. Use of the plywood, Sell n Swap Replies: 1 last:. Paint or polyurethane forum Buy, Sell n Swap Replies: 5 last Post 7th. 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