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. Plywood can be treated in a number of ways for outdoor use, but it really depends on the intended use of the plywood. Use a knife or a razor blade to cut the tip from the tube of caulk. The Best Ways to Paint and Seal Plywood. Combo Member. Allow the exterior plywood surface to dry completely. By Ben + in forum Buy, Sell n Swap Replies: 1 Last Post: 28th Aug 2011, 10:03 PM. First method, you want to seal the wood. You need an extra strong finish and no leak at all for the wood to keep its initial moisture level. Plywood, while a relatively inexpensive product to use, can be particularly tricky when it comes to … A quart size goes a long way so it's cheaper than spray also. I am needing to seal it up as best we can such that it will last a long time. Treating Plywood and sealing edges. Once it is sealed, you may finish your project with paint or polyurethane. 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. I use outdoor … It is basically a deck, but it will have 3/4 plywood for the floor. They will have to tolerate all sorts of weather, and that warrants a change in the way you choose your sealer product. Obviously, these have to be a little bit tougher than the others. There's two different ways to bring up the topic. Surface sand, prime and then use a decent exterior wood paint. How to Finish Pine for Outdoor Use. Wozy68 Plywood is one of the most versatile and cost-effective building materials, and as a result, it is also one of the most popular. Also with the layers of plywood the edges really need sealer to fill in the uneven holes and layers. It worth the extra bucks. 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. Make sure your paint is outdoor as well. You may find the materials for sealing plywood at any hardware or home improvement store. Buying A Sealer For Outdoor Use. If you have pine woodwork or outdoor furniture, applying a finish can protect it from sun or weather damage. Insert the tube of caulk into the caulking gun with the tube nozzle pointing away from the trigger. However, more waterproofing is always a good idea for materials that you're planning to use on outdoor projects. What to use to seal exterior Plywood ceiling. 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. As you might guess from the title, this article is focused on sealers that are intended for outdoor use. I'm restoring an old horse drawn cart, using 18 mm exterior ply. I use a water based outdoor polyurethane sealer. If you want your outdoor plywood furniture to last, you should use marine grade ply. Cheap 14mm thick Plywood / Plywood Pallets. 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. 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 … 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. Use the caulking gun to apply caulk to all cracks and seams in the exterior plywood. Waterproofing Exterior Brick. Don't PVA it, but do make sure you seal the edges very well as this will be key to maximising its performance. 1 last Post: 7th Oct 2012, 07:14 PM 7th Oct 2012, 07:14.. Marine grade ply an old horse drawn cart, using 18 mm exterior ply any hardware home... 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