To start the project, sand the wood surface with a 320 or 400 grit sandpaper to remove minor surface defects from the wood. I left the table to cure in my shed. Note: where de-nibbing is not needed, e.g. What is this part of an aircraft (looks like a long thick pole sticking out of the back)? Allow each coat to dry fully. Remove all dust. Remove tack cloth residue with denatured alcohol on a cloth. The highlighted portion is part of the problem we face in the woodworking world: that even manufacturer instructions can't be trusted to be accurate. A couple light swipes may be all that's needed, especially -- again -- if the poly is still curing. I'm shocked that you would implicate the manufacturers in attempting to get you to use more of their product than necessary! 20 posts in 1281 days. Forum topic by Thomas Anderson: posted 06-05-2017 03:15 PM: 19133 views: 0 times favorited: 14 replies: Thomas Anderson . "Hot-coating" (applying a second coat of poly over the first without sanding) has become an accepted technique. 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. Why would they suggest I sand with that grit if it takes away the coats to begin with? After the first coat, all you are trying to do is remove the bumps and scuff the surface for the next coat, so 220 is just too rough. It does not invalidate any of the other content in the post so we should be good. Put on a second coat forgetting to sand it between. How to efficiently check if a matrix is a Toeplitz Matrix. Sanding with 220 grit with only a few passes it looks like I sanded through the two coats down to wood!? This depends on the specific varnish -- viscosity varies and some build faster than others -- and how you apply it (padding typically puts down a thinner coat than a well-handled brush) -- but three-to-five coats should give you as much protection as most things will need, and can give you quite a nice shine. Between each coat the polyurethane must be sanded with a light-grit sandpaper. Let dry 4-6 hours. Since I don't need an exercise in futility I opted for 3 coats. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Always allow polyurethane to dry 24 to 48 hours before sanding, to give the surface time to cure and harden. Could you guys recommend a book or lecture notes that is easy to understand about time series? It should be done for one reason only: de-nibbing, where it serves a specific, and necessary function for most users. It only takes a minute to sign up. Thanks again as always. To create a good resistant finish, multiple coats of the polyurethane may be required on the wood surface. The most egregious part of this is that sanding is not needed to ensure adhesion between fresh coats of poly. Polyurethane is typically my go-to finish, but I'd always just kind of done it how dad showed me rather than reading the instructions, sanding with fine grain between coats, or not at all if it's still "tacky." I did 2, what I thought were, thin coats 3 days apart and the last one was 2 days previous to now. @bowlturner I updated the title. Issue with that was my shed seems to have become a haven for boxelder bugs. « back to Finishing forum. Why do I need to turn my crankshaft after installing a timing belt? Woodworking Stack Exchange is a question and answer site for professional and amateur woodworkers. Quick link too easy to remove after installation, is this a problem? I don't know where the confusion arose but the 21 coats refers to a traditional drying-oil finish, not varnish. You have to sand those with very light sandpapers. Polyurethane Book Case is Rough, Sand in Place? Sand with 220 grit after first coat and wipe down with a tack cloth. Apply a final coat of polyurethane within 48 hours of the previous coat. The most egregious part of this is that sanding is not needed to ensure adhesion between fresh coats of poly. The tack cloth will remove small particles of wood dust created by the light sanding. Apply second coat. I prefer the 320 grit between coats. Is it bad to sand extra-fine before applying Poly? Popular Woodworking; The 7 Myths of Polyurethane; Bob Flexner. When they say "sand lightly," they mean very lightly, just enough to roughen the surface a bit to help the layers mechanically lock into each other and reduce the risk of one peeling awsy from the other (which is supposedly possible). I put six padded coats of poly on the end table I just refinished and got a "wow, look at that shine" reaction... but the first two were tinted (which I usually avoid on principle, but in this case it was handy) and the last one or two were just cheap insurance. How do I prevent stain from being removed during sanding? Polyurethane is a type of varnish with a resin that adds heat-, scratch-, water- and solvent resistance to the wood on which it's applied. Sand the finish once to remove any built up dust ridges on the finish. Allow the product to dry as before according to label directions and environmental conditions. Polyurethane dries slowly, so there are always dust nibs that should be sanded out before the next coat is applied. What is the cost of health care in the US? Follow Steps 2 and 3 between each polyurethane application. 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. Are my poly coats to thin? 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. Work the urethane finish with the grit side of the sandpaper lightly in one direction. Cutting out most sink cabinet back panel to access utilities. Generic word for firearms with long barrels. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Clean the surface with the tack cloth. Which would be an issue except they pissed on the table in several places. Apply a THIN coat of Minwax® Fast-Drying Polyurethane using a high-quality natural or foam brush. home | projects | blog. Allow the first polyurethane coat to dry. What does commonwealth mean in US English? Possibly, but I think you should have first tried a non-sanding approach. G.K. Bayne is a freelance writer for various websites, specializing in back-to-basics instructional articles on computers and electrical equipment. If any blemishes or bumps are still seen, use the same sanding process to remove them. In addition to that, sanding between coats specifically should not be relied upon to ensure a smooth, uniform finish (there are much better methods, none of which waste finish needlessly, more on this below). Is the word ноябрь or its forms ever abbreviated in Russian language? By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. reply from a potential PhD advisor? How should I consider a rude(?) This is one of the other reasons I personally object to that part of the finishing instructions. Never sand a tacky surface as the grit of the sandpaper will quickly become clogged with the polyurethane material. 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. No one I know of has ever suggested 21 coats of poly. Then lightly sand entire surface with fine sandpaper (220 grit) to ensure an even finish and proper adhesion. 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. Obviously they didn't intend for that to happen and I am doing something I am not supposed to do. My problem involves quoting the instructions on the can and giving some background into my process. Poly is a varnish then... dammit. Bayne began her writing career in 1975 and studied history at the University of Tennessee. Between each coat the polyurethane must be sanded with a light-grit sandpaper. Some of it just chips off but I needed to sand out several of them. Polyurethane applied to a wood surface when temperatures are below 50 F may take the product longer to dry. 06-05-2017 03:15 PM . It seems to work better if done right after the first coat has dried, perhaps because it's still polymerizing.

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