But why do people say to sand the nibs out? However, there is a way to remedy these flaws without undoing a day's work. “Because you didn’t make either of those mistakes, and because the poly didn’t bubble on the underside of the table, I suspect the top surface is contaminated with a silicone- or wax-based polish. I brush the polyurethane on with a plumbers brush and I brush it until there are no or very little air bubbles and then as it drys more air bubbles seem to form in the polyurethane. Painters and furniture finishers hardly ever apply polyurethane with a roller because of its propensity for forming bubbles. All the stain has worn off. (You can use a natural bristle brush with oil-based poly, but keep an eye out for loose brush hairs.) It looks to me like the bubbles come up out of the wood into the poly while it is drying. Why is the polyurethane still tacky a whole week later? How do I avoid or remove the scuffing? We had it sanded, stained and polyurethaned. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Beading or separation while refinishing furniture may mean that the furniture has a layer of silicone leftover from a cleaning or waxing product. *Thanks Gretchen and Dan,My bases are cherry. By the way, water-based polys are less likely to have bubbles than oil polys because each coat is much thinner. Spread the varnish over the entire surface with long, even strokes. Test the finish if you don't know what type it is. Switching from the light cut to heavy cut polish was the key. Polyurethane, in my experience, is both harder and tougher than traditional varnish. Method 1: Remove Bumps From Fresh Finish Dab the bumps lightly with the help of tip of the brush. If they are pimples and there aren't a lot of them, you could try to…, We removed old linoleum and found very nice pine flooring underneath. “I know that’s a lot of extra work, but in the end you’ll get the results you’re looking for.”, from the Jul/Aug 2017 issue of This Old House. I would expect a very different result.Varnishes themselves ("polyurethane" is an additive to varnish) vary greatly according to the resins used, and the amount of oils in them (and undoubtedly a huge number of other factors).For example, the typical spar varnish is a long-oil, probably phenolic resin-based varnish. Minimize this problem by applying thinner coats or by switching from standard brush-on poly to a wipe-on or spray finish, both of which can be applied in very thin coats. At the pro or high-end level the goal with these is to get a smooth build using gloss and then apply one coat, two at the outside, of the reduced-sheen varnish as a final coat. We were told that this was to be expected with a soft…, Q: After using B**** Coatings oil poly for years on floors without problems I was forced to return to D******* oil. Next, brush on a couple of coats of dewaxed shellac, such as Zinsser’s SealCoat. Apply a fresh coat of finish, moving the applicator slowly to avoid turbulence and more bubbles. Also, try this out on a test panel first to make sure you like the result. Polyurethane Book Case is Rough, Sand in Place? Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since 1975. To create a completely polished surface, it may be worth it to sand the surface of your wood. Now it's an ugly, grey, worn floor. My experience shows otherwise, could product brand cause the differences? Subscribe to Fine Woodworking today and get our lowest price of the season - only $20 for one year. Have…. To reveal flaws (bubbles, brush marks, etc.) Our biweekly podcast allows editors, authors, and special guests to answer your woodworking questions and connect with the online woodworking community. As a landscape builder, he helped establish two gardening companies. Woodworkers have developed several types of wood finishes, and there are many ways to categorize them. In a couple of … From memory, the directions I always see on cans of poly is to sand between coats, not to sand after a final coat. Loose or Creaking Boards & Tight or Popping Boards, recommendation to hire an experienced pro. Sometimes when I apply polyurethane, for whatever reason, it's not completely smooth. This website suggests the following technique to polish a gloss polyurethane finish: So I guess I have at least the answers to my question and now have to make a decision to just let the bubbles or pimples, if the occur, be or try one of the other methods I mentioned above. No air movement during application and for several hours after. I am having trouble with little air bubbles in my polyurethane finish on my wooden bases. This happens to floor finishers who drag the finish applicator aggressively and then must stay off the floor until the finish dries. “The most common causes for bubbles are shaking the can and improper brush prep—you don’t stick a brush into the finish without first soaking the bristles in mineral spirits, for oil-based polys, or in water, for water-based polys. Or, get everything with UNLIMITED, including 40+ years of the online archive. If you’re working on a project that involves wooden furniture or paneling, you’ll likely find yourself facing an important decision at the end: varnish or polyurethane for the finish? To learn more, see our tips on writing great answers. You can use the abrasives you're already using, but another tip you might like to try is to use the rough side of brown paper.
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