Remove all dust. And actually it's not needed between coats of any varnish and never has been. There is no substitute for sanding between each coat if you want the best finish. 06-05-2017 03:15 PM . Apply second coat. Possibly, but I think you should have first tried a non-sanding approach. Typically the sandpaper should be run over the surface in the same direction as the wood grain. No one I know of has ever suggested 21 coats of poly. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. Let dry 4-6 hours. Why do I need to turn my crankshaft after installing a timing belt? My problem involves quoting the instructions on the can and giving some background into my process. From other answers on WW I understand that applying only a few coats of poly can be sufficient but traditionally you could use as many as 21 over the course a year. Never sand a tacky surface as the grit of the sandpaper will quickly become clogged with the polyurethane material. Nonetheless, water-based stains will always require you to sand between the coats of stain. A couple light swipes may be all that's needed, especially -- again -- if the poly is still curing. If manufacturers were truly interested in helping their customers to apply the product most effectively, as they say or imply, what they would do is give people specific tips on how to apply smooth, even coats of varnish such that no sanding would normally be required (except to de-nib). On the other hand, polyurethane stains require something different. I prefer the 320 grit between coats. @bowlturner I updated the title. It immediately took off the thin coat I had applied, even with just a very light sanding, and even took off some of the stain I'd applied underneath. Here’s the way to approach sanding between coats: Do it anyway. Without 320 or 400 grit sandpaper, the entire look of the can get destroyed. Between each coat the polyurethane must be sanded with a light-grit sandpaper. Allow the product to dry as before according to label directions and environmental conditions. Then dampen a clean cotton cloth in water and rub automotive rubbing compound onto the surface in a circular motion -- the compound will remove any slight scratches left by the sandpaper. When applying polyurethane, brush along the grain, stretching the polyurethane … Why would they suggest I sand with that grit if it takes away the coats to begin with? Try to get the "non-filling" type, like the waterproof or aluminium oxide. How to sustain this sedentary hunter-gatherer society? Issue sanding between coats of polyurethane, MAINTENANCE WARNING: Possible downtime early morning Dec 2/4/9 UTC (8:30PM…, “Question closed” notifications experiment results and graduation. Particularly cheap poly, which Minwax is an example of. What does commonwealth mean in US English? It always seems to turn out fine, but recently I read the back of the can and it said to wait 4 hours between coats (i.e. Sand the urethane surface a second time in preparation for a third coat. Clean the sanded wood surface with a tack cloth before applying the first coat of polyurethane. Polyurethane dries slowly, so there are always dust nibs that should be sanded out before the next coat is applied. Since I don't need an exercise in futility I opted for 3 coats. Between each coat the polyurethane must be sanded with a light-grit sandpaper. Work the urethane finish with the grit side of the sandpaper lightly in one direction. Generic word for firearms with long barrels. Clean the surface with the tack cloth. I left the table to cure in my shed. There are uncountable examples of this to prove the point, as Bob Flexner makes some reference to in The 7 Myths of Polyurethane on Popular Woodworking. Wiping down with warm soapy water would have probably been the first thing I would have tried :-). Allow the first polyurethane coat to dry. Sanding Between Coats by Alan Noel Professional Wood Finisher When applying several coats of finish to a project it becomes necessary to sand between coats to not only remove any trash that has settled into the finish but also to promote good adhesion between the layers of finish. I had earlier oil questions and, while I never said poly outright, I was reading the answers like there were talking about poly. The most egregious part of this is that sanding is not needed to ensure adhesion between fresh coats of poly. A beginner's question about sanding, stain, and polyurethane for a SMOOTH finish. That’s why it’s important that you stay extra careful while doing this for polyurethane stains. This is just like the directions for some stains and for oil/varnish blends, where supposedly only by applying a liberal excess of the product and then wiping almost all of it off can good results be achieved. Thanks for the article. @bowlturner In error I thought that poly was oil like danish or tung. It only takes a minute to sign up. To start the project, sand the wood surface with a 320 or 400 grit sandpaper to remove minor surface defects from the wood. The sanding between coats accomplishes two things: It removes defects from the applied urethane as well as small dust particles lodge in the dry finish. reply from a potential PhD advisor? Bear with me. Issue with that was my shed seems to have become a haven for boxelder bugs.
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