How to Sand Out Bubbles from your finish. There are specific rules to be followed in applying any finish, whether oil or water based. This removes the high spots, the embedded dust, the laps, etc. Getting a smooth, blemish-free finish with oil-based polyurethane is within your grasp if you follow the steps in this article. Let dry 4-6 hours. Unsanded wood is hard, bumpy, and often unpleasing to the eye. Always stretch the polyurethane as thin as you can. Brush marks often show up on pieces of furniture treated with polyurethane finish, usually despite the best efforts of the craftsman. However, do not worry if you have applied polyurethane coats unevenly. I like to use a green Scoth Brite pad. Polyurethane is the modern product most often used as varnish, or clear finish, on stained and painted wood surfaces. There are always some little imperfections and spots. I am in the process of redoing a bureau. ; Start with 120-grit sandpaper on refinished pieces and 80-grit on new wood. The wiping poly is the easier product to get good results short of spraying the finish. Wood pieces that are not completely sealed with polyurethane can warp because moisture can enter the wood through the unsealed surface. Apply second coat. I used a gel stain for color and then I have applied 3 coats of Varathane polyurethane with a satin finish. You can use a belt sander on larger projects, or sandpaper by hand on smaller wood items. If you don't have a soft enough brush or it's too hot or you don't work it fast enough then you are left with a bunch of brush marks to contend with. Take your time, like the pros do, and you'll create a durable, smooth, lasting finish. If your kitchen table is made of oak or ash, take a wood grain filler and apply it before the poly. This ensures the protectant goes on smoothly and actually provides a finished look. This Site Might Help You. You really want that final layer of finish to be thick enough to withstand the rubbing out process. Dip your brush gently and take your time painting the surface. However, you do not want to sand the final coat or you will end up with a … Otherwise, it will show through on your next coat. If a second coat is needed (and I usually advise at least 2 coats for normal furniture and 3 coats for high traffic or areas around water), you will want to sand, vacuum and tack cloth the piece between coats. How many coats of polyurethane should be put on hardwood floors? Our 8-step approach shows you how to apply the varnish successfully. I'm not really a fan of poly, I find it dies too quickly. Personally, I would do it but you’ve got to consider how your clear coat might effect the decal down the line. Lightly sand in between poly coats. The finish should feel smooth and flat, no bumps. Aim for a smooth, uniform finish. If you really want that mirror finish, spray the final coat. Then lightly sand entire surface with fine sandpaper (220 grit) to ensure an even finish and proper adhesion. You’ll get the best results from your topcoat if you remove any old paint, varnish or other finishes before polyurethane application. Step 13 Apply two sealer coats of polyurethane mixed with mineral spirits to the underside of the piece of furniture if it is made of traditional hardwood lumber. Do not sand the paint before applying poly. 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. Make sure that you have plenty of mineral spirits on hand to clean up your brushes and any type of mess that you create. Wait for drying I've sanding, conditioned, stained and so far have applied 2 coats of satin polyurethane. No sanding required. Intercoat abrasion with a multi-disc and 220 grit sandpaper Polyurethane wood floor finish tip: When you abrade your floors, make sure you buff out any dust, particles and bubbles, before cleaning and tacking. Do not buff the final polyurethane finish coat. 7. For the final coat, if I really want a smooth coat, I will use a spray can, just for the last coat. When you sand and rub out the final finish you take off most of the surface which contains the satin. For polyurethane, you’ll probably apply five to ten coats. How do you get that hard smooth finish? I didn’t shake the can, and the brush didn’t leave any bubbles behind. Do this by sanding out the bubbles then apply a fresh coat of the product. I am primarily doing this on decent sized flat surfaces, 5-6 sq/ft. No, you are not supposed to sand the final coat. A gloss finish since it is free of flattening compounds is clearer. The paint and Polyurethane will mix and fill the layers, any holes, and printed flaws. A good-quality natural-bristle brush, a reasonably dust-free, well-ventilated space and some patience are all you need. But large bubbles formed in the second coat about 10 minutes after I applied it. Unfortunately, despite using an all natural brush, I can still see brush strokes. Normally, the property of the floor surface also affects to the finish paint quality. Ultra-smooth surface is inevitable in terms of getting an excellent finish. For hardwood floors, there are more coasts of PU than normal ones. Similarly, if you want an impressive final finish, the wood surface has to be smooth and clean before applying the poly. Apply a full-strength final coat. So brushed-on coats of a standard varnish would do the trick nicely. However, there is a way to remedy these flaws without undoing a day's work. The thinner each layers and the longer you let each layer dry the better. Find a paint brush that is super soft to apply it. After 40 plus years of finishing doors, woodwork, furniture etc I can tell you what I use and it's easy and comes out baby butt smooth. Sand the coat lightly with 220-grit sandpaper when dry. The final one is the polishing coat: many users use PU to create the glossy surface for wood products. With water-based polyurethane finishes, you generally don’t have to buff after each coat to achieve adhesion if it is applied within so many hours. How do you make a matte finish with polyurethane? If you do not sand the primer appropriately, you might have blotchy stains on the piece when you apply the final coat of paint. How Long Do You Let Polyurethane Cure Before Wet Sanding?. Oil-based polyurethane varnish brings out wood's natural beauty and grain. This step will remove any rough patches and give the piece a smooth finish. If third coat is desired, repeat step 5 before application. Overall, Polyurethane is the easiest form of finish that even first-timers won't have difficulty in applying. You should ensure that you sand the previous coats so that you create a perfectly level and even base for your final coat. It levels out so nicely. I waited 20 minutes between layers and then waited an entire day before spraying the final coat of spray paint to cover any discoloration. If this is your first time working with Varathane, there may be some uneven spots. Try to get the "non-filling" type, like the waterproof or aluminium oxide. Instead, it would be best if you sprayed it or spread it in a nice and level way. Three plus will get a smother finish. This will ensure a super smooth finish. The problem is easily fixed. As for figured cherry, there should be no reason to pore-fill. If you miss the bubbles when the polyurethane is still fresh, you can even get rid of them after the finish has dried. I prep sanded the wood using 80 grit and worked up to 220 grit. You apply the final coat, let it dry and you're done. Applying polyurethane in even coats is a crucial, though not always simple task. In the photo below, you can see what we are looking for when buffing. For a smooth coating you’ll want the surface to be as smooth as possible, so prepare the wood by sanding it with a sanding block or orbital sander. If you notice significant bumps in the dried coat, use a razor blade to shave these off. Several light coats will get you a smooth finish. Take 220 – grit paper to sand the wood. After I stripped, sanded, and stained my solid-oak kitchen table, I brushed three coats of polyurethane on the underside. Before my "final coat", even if my previous coat was perfect, I sand with 400-600 and 0000 steel wool to make it silky smooth before that last coat. Pop any bubbles you see by brushing back over the finish. There’s a running debate on whether or not you should apply your clear coat over your vinyl decals. How do you polish these few imperfections out of polyurethane after the final coating to still maintain a high-gloss, smooth finish? How to Remove Brush Marks From a Polyurethane Finish . Now that the coat is dry, you can lightly sand its entire surface. So, the spots are too noticeable for this type of project. Step One – Use 120 grit or finer sandpaper to scuff sand the bubbles. Do You Sand the Final Coat of Polyurethane? Primers can often be thick and difficult to clean up. Any slight specs after the final coat will be rubbed out. I am staining and finishing oak doors for the first time. I prefer the 320 grit between coats. Heating, dropping rocks and chiseling the wood. Remove all dust. Thin coats will result in you burning through the top layer. Rubbing out the finish you would re-create the satin by scuffing the finish with 0000 steel wool. If you are going to brush it do it sometime when the temperature is under 90. I personally prefer using a small foam roller and foam brush' Smooth finish, no brush marks. It came out great. If you are going to do that you might as well use a gloss finish. Move in the direction of the wood grain. There seems to be a lot of controversy on a rough first coat of polyurethane and what to do about it. The first coat on the top looked good too. Hand Rub With Wipe-On Varnish or Oil If you want to transform the sheen from high gloss to satin or matte, then using a hardening oil such as tung oil is a good way to do it. After the final coat dries for 48 hours or more, we wet sand it with water and 400 grit sandpaper. So we “rub out” the final coat to make it smooth and flat. Apply a THIN coat of Minwax® Fast-Drying Polyurethane using a high-quality natural or foam brush. Just as you did with the initial coats, brush the polyurethane onto the surface, working systematically from one side of the project to the other. Sanding removes the lines and ridges created by the … Oil-based polyurethanes are easy to apply but take too long to dry while water-based polyurethanes usually require multiple applications and have a whitish consistency upon application which disappears once dry.. Water-based polyurethane also tends to dry faster. While it’s good practice to use fresh varnish, I recently used some that had been sitting around for 15 … But, you always have to buff it once. After final coat rub out with 0000 steel wool and wax with carnuba. No matter how many coats you add of Polyurethane, the look will still not be completed. After your final sanding, apply your final finish coat. What do you do after you apply the final coat of polyurethane to smooth out the imperfections? Typically, two to three coats are used with sanding in between coats to even them out. RE: How do I smooth out uneven brush strokes in polyurethane? A little test of how well polyurethane works when there are 40 coats. Is one coat of polyurethane enough? Any slight specs after the final coat will be rubbed out. You can apply it and leave it (if you have a good dust free environment) this will leave you with the best sheen, or you may need to do a final buff out with very fine sandpaper 400 grit, then buff out with a rag, this will leave you with a very smooth “hand rubbed satin” finish. So, my final coat is not mirror smooth. You'll want to cover your wood furniture item with several coats of protective polyurethane. Then we buff with an abrasive pad. I’d go with about 5 coats. Final Finish. Varathane Professional Interior Varnish is my #1 pick right now. It is best to sand your wood before any coats are added. So I sanded them out and brushed on a new coat. Let the polyurethane sit for about 10 minutes after stirring to allow the foam to settle. At least three coats of poly. 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