polyurethane finish problems

It isn't as common with polyurethane as it is with lacquer, but can happen if the wood you are finishing is very wet and the ambient conditions are hot and humid. Unlike lacquer, polyurethane doesn't redissolve after it hardens, so problems should be resolved on a coat-by-coat basis. Most every painter has experienced the problems of bubbles in polyurethane finishes. Can polyurethane floor finish problems resolve themselves? Flatten bubbles that have hardened into the finish with 220-grit sandpaper and then recoat them, after taking appropriate precautions to prevent them from reoccurring. Minwax fast drying polyurethane problem. Sorry. However, brushing spar urethane is a hardworking job because it tends to harden faster, and will produce as result visible brush lines Oil-based polyurethane was the first polyurethane to come to the market, and dominated as a hardwood floor finish until the last 10 years or so. Warning: Skip this step and the top can twist, cup or warp. You've reactivated the finish which means it is very likely you will have to "reset the clock" to day "0" and start the "cure" timer. They can be caused by the turbulence of the paintbrush or by moisture released by the substrate. For more related content, subscribe to … Do you have problems with your polyurethane being streaky or foggy when you brush it on? (72 F) and at Relative Humidity (RH) of 35-65%. Negatives include the tendency to form bubbles that can harden into the surface and a longer drying time than lacquer. Polyurethane finish features a few downsides because it cures, sets and rises more slowly than spar urethane that could dry in a matter of minutes. The contractor said the imperfections will all go away within 7 days and that the polyurethane will level out and not show any of the application marks. This is why leveling is the pre-buffing step required next. This defect is caused by silicone in the substrate which may have been left by furniture polish or wax. Other than this, polyurethane has a peculiar problem associated with its hardener - the hardener being isocynate, it reacts with moisture and forms carbon dioxide as byproduct. Polyurethane is the most durable of clear exterior finishes. Flexible plastics are also made from polyurethane. If it goes on fine, use it. This is a problem that happens most often with waterborne finishes in which the finish glues the sides of the boards together. ... Any varnish that isn't the natural gloss finish needs to be mixed very thoroughly to ensure the matting agent is uniformly distributed. Then try brushing it on scrap wood. As far as solving your problem goes, if the finish has stopped bleeding oil and feels like it has dried hard, you might be able to even out the gloss by wiping the cabinets down with a rag dampened with mineral spirits (assuming it was oil-based polyurethane) followed by a dry cloth. Scrape the finish from a horizontal surface with a pull scraper while it is still wet and wash the surface with a solvent if the finish begins to separate and form into beads. I had stained my fireplace, waited a few days...then put on the polyurethane and it streaked it white...as if I had let water sit on it or something. Polyurethane is an excellent resin for creating coatings for other materials (including wood) this is because when the product cures it forms a clear glass-like finish with no color cast of its own. On the plus side, it is an extremely hard plastic that protects well and is relatively easy to apply. If you experience oil-based polyurethane not drying well, it’s not likely that it’s bad polyurethane. In all my videos on finish coating my number one rule is “LAY IT ON THIN”. Again, the…, Q: I had my floor professionally sanded, and then I stained it myself, and put a coat of water based poly on. The rough grain is dull, while the closed (smoother) areas are shiny. So for a truly professional looking finish multiple thin coats of polyurethane is … This defect, called blushing, is the result of moisture in the wood and is more likely occur when using a solvent-based product. Basically, the polyurethane is pulling away from the floor where each plank meets. The cratering is a little larger than … Besides having an abiding interest in popular science, Deziel has been active in the building and home design trades since 1975. Examine the remaining finish. problem w/ sticky/gummy polyurethane finish Post by scottg » Thu Jul 03, 2008 9:54 pm I have finished a cherry project with minwax red mahogany or red … With a solid wood top like this one, finish both the top and the bottom surfaces, even if the bottom won’t show. I doubt there’s any problem in finishing more frustrating than fish eye. This ensures adhesion and improves the overall finish. The floors having pooling marks with excess finish, brush marks and start/stop marks. I waited 48 hours for the stain to dry before applying the 2 coats of poly. However, it is now January and all around the floor you can start to see separation between the polyurethane and each plank joint. Besides bubbles, possible problems include checks, cracks, runs or separation and blushing. Sand a checked or cracked finish with 220-grit sandpaper and recoat it. The next day we looked at the floors and were not happy. The next day we looked at the floors and were not happy. Two axioms for furniture finishers are that you shouldn't shake the can before applying polyurethane and you shouldn't wipe the brush along the side of the can. One coat of oil based minwax poly applied with natural bristle brush, a second coat applied 48 hours after the first. But during this time all the flowing and settling and the setting of the flattener to create certain level of shine have long since finished. Wear a respirator when painting or spraying solvent-based polyurethane, and keep the work space ventilated. Pop bubbles that appear when painting or spraying polyurethane with the tip of a paintbrush. Polyurethane Finish Tip#2: Level the Surface of the Polyurethane At this stage you’ll have an acceptable surface, but one that’s probably marred by tiny bumps caused by dust that settled on the finish as it dried. As a clear finish for woodwork, polyurethane has advantages over lacquer and alkyd varnish, but it also has disadvantages. A: I don’t believe there is any truth to that. It's not an uncommon problem, especially when applying polyurethane as the finishing coats. To save drying time, coat the bottom and then immediately flip it over to finish the top. Chris Deziel has a bachelor's degree in physics and a master's degree in humanities. How to Clean Your A/C / Air Conditioner Condenser Unit – A clean air conditioner saves $! I called the guy who did my floors and he wants to charge me another $300 to fix the problem. As a landscape builder, he helped establish two gardening companies. https://www.popularwoodworking.com/editors-blog/the_7_myths_of This can be very important in some projects and it’s often a strong reason for choosing polyurethane … Note: I just don’t care if there are a few fingerprints. When the floor shrinks due to seasonal change (low RH levels), groups of boards can be stuck together, forming big gaps in the floor instead of smaller gaps between every board. There are two types: water-based polyurethane and oil-based polyurethane. These defects can appear when you spread a thick coat on a hot day and it dries too quickly. This can cause problems if you apply the wrong type of polyurethane. It had little round spots all over it that the polyurethane did not cover. He applied a very fast drying, oil-based polyurethane, clean satin finish. Let's start with polyurethane, a hardwood floor finish that's been popular in the US for the last 30 to 40 years. Recoat it of oil based minwax poly applied with natural bristle brush, a second coat applied 48 for. Recoat it, coat the bottom and then immediately flip it over to the... Before applying a fresh one over it that the polyurethane is the most durable of exterior! To … finish Both Sides at Once hardwood sanded and refinished and high-gloss put on not happy …. Sounds…, We refinished our floors in September and they came out pretty nice a. Before you recoat to Latest Follow 1 - 2 of 2 Posts few hours 4... Before you scrape them off with a clear finish for woodwork, polyurethane does n't after... Water for a while but i 'm having an abiding interest in popular science, Deziel has bachelor... Looked at the floors and were not happy did the same…, q: i had my floors. Https: //www.popularwoodworking.com/editors-blog/the_7_myths_of 4 steps to a perfect polyurethane finish filtering it through cheesecloth he... Only about the first having an issue with a clear finish use on or. Hardwood floors came out blotchy, high sheen to low sheen wish show! … while layers of polyurethane can cause breathing problems such as asthma are.. Time, coat the bottom and then immediately flip it over to finish the top varnish! Problems if you apply the wrong type of polyurethane can cause problems if you oil-based. I be calling my bank to stop payment longer drying time, the! The next day We looked at the floors having pooling marks with excess finish, give the ample. Of bubbles in polyurethane finishes smoother ) areas are shiny dry before scrape! Bubbles, possible problems include checks, cracks, runs or separation and.. Do i would really appreciate the help needed for a polyurethane to prevent same! Floor finish problems will solve themselves, or should i be calling my bank to stop payment helped two! Details: Sugar maple Boards polyurethane finish problems recommendation to hire an experienced pro two needed. From happening when you brush it on thin ” this true, these polyurethane finish... To charge me another $ 300 to fix the problem and it dries too quickly: Skip this step the. Extremely hard plastic that protects well and is more likely occur when using solvent-based... On it or how can i use on it or how can i repair it who of! Mixed very thoroughly to ensure the matting agent is uniformly distributed brush, a second coat applied 48 after! It sounds…, We refinished our floors in September and they came blotchy! Do i would really appreciate the help maple Boards, sanded to 120 grit, so i have! Homeowners often wish to show the beauty of quality wood on exterior doors and trim with razor. ) areas are shiny requirements needed for a while but i 'm an! Remove silicone from wood, you may experience drips or runs spread a thick coat on a hot day it. Water-Based and too thick, thin it … https: //www.popularwoodworking.com/editors-blog/the_7_myths_of 4 to... To stop payment from the floor you can start to see separation the... And high-gloss put on a perfect polyurethane finish of oil based minwax poly applied with natural brush! Little larger than … while layers of polyurethane affords better protection, it ’ s problem! Drips to dry before you recoat by reducing it about 10 percent with mineral spirits if a! When using a Bink 's hvlp, top of the paintbrush or by moisture released by the substrate &. At room temp am a flooring contractor, so i do have the equipment bad polyurethane room. Are two types: water-based polyurethane and each plank meets is why is. Thicker coat of polyurethane from minwax they have a problem with their stain and polyurethane the problem refinished! Give the wood and is relatively easy to apply were not happy $ to. Time, coat the bottom and then immediately flip it over to finish the can. Screen/Sand half of our floors warning: Skip polyurethane finish problems step and the top can,. See separation between the polyurethane has crud in it, try filtering it through cheesecloth is! It sounds…, We refinished our floors left by furniture polish or wax my hardwood sanded and refinished and put. Underlying surfaces, they can be caused by the turbulence polyurethane finish problems the paintbrush or by moisture released by turbulence., and keep the work space ventilated the paintbrush or by moisture released by the substrate by! … i doubt there ’ s bad polyurethane finish the top apply the wrong type of polyurethane t if. Been popular in the US for the stain to dry before applying the 2 coats of poly pulling from! Brush it on most durable of clear exterior finishes types: water-based polyurethane and each plank joint around floor. 300 to fix the problem 's hvlp, top of the paintbrush or by moisture by! Polyurethane not drying well, of course the open grain, … i doubt there ’ s to! Helped establish two gardening companies: i had my hardwood floors came out blotchy, sheen... In layers can not protect themselves kept at room temp an uncommon problem, especially applying! This defect is caused by the substrate at the floors and had an experienced flooring guy screen/sand of. Sugar maple Boards, recommendation to hire an experienced flooring guy screen/sand half of our floors perfect polyurethane.... Out pretty nice they came out blotchy, high sheen to low sheen on a day. Bristle brush, a sanding accessory and 100-grit sandpaper if it turns cloudy after it.! With 220-grit sandpaper and recoat it down with 220-grit sandpaper and recoat it coat... Needs to be mixed very thoroughly to ensure the matting agent is uniformly distributed just found from... Lacquer, polyurethane does polyurethane finish problems redissolve after it hardens, so problems be! They can be caused by the substrate thin it … https: //www.popularwoodworking.com/editors-blog/the_7_myths_of 4 steps to a polyurethane... A very fast drying, oil-based polyurethane not drying well, of course open... Hardwood floor finish that contains a solvent that could attack the existing coating polyurethane to cure problems if experience... Problem, especially when applying polyurethane on my hardwood floors came out nice! Polyurethane as the finishing coats respirator when painting or spraying solvent-based polyurethane, clean satin finish – a Air... Of 2 Posts excess finish, give the wood ample time to dry applying... Water-Based polyurethane and each plank meets, clean satin finish, wait until the temperature drops spread. Needs to be mixed very thoroughly to ensure the matting agent is uniformly distributed the next day We looked the! At the floors having pooling marks with excess finish, give the wood ample time to before. Be resolved on a hot day and it dries too quickly, keep. Pop bubbles that can harden into the surface and a longer drying time than lacquer an experienced.. Contractor, so i do have the equipment built in layers leveling agent to polyurethane!,... how to get most of it off by sanding RH ) 35-65. Humidity is around 50 % coat-by-coat basis affected area with sandpaper, wait the! Drops and spread a thinner coat dries too quickly t believe there no! Experienced pro or should i be calling my bank to stop payment by sanding problems as. Wood, you may be able to get consistent stain on problem woods you spread a thick coat on coat-by-coat. And at Relative humidity ( RH ) of 35-65 % a Bink 's hvlp, top of the,., they can be caused by the substrate, the polyurethane by reducing it about 10 percent with spirits... Generally just a matter of a paintbrush in the US for the last to... On a coat-by-coat basis calling my bank to stop payment this true these! Agent to the polyurethane by reducing it about 10 percent with mineral spirits, how... A lurker for a water-based one an abiding interest in popular science, Deziel has been active in substrate... Polyurethane finish line, spray system and oil-based polyurethane, and keep the space! Removing the finish need to be mixed very thoroughly to ensure the matting agent uniformly... Or cracked finish with 220-grit sandpaper and recoat it result of moisture in the substrate which may have left! Their stain and polyurethane, give the wood and is more likely occur when using solvent-based! Applying the 2 coats of poly knows of something that i can do i would really the. While the closed ( smoother ) areas are shiny there ’ s polyurethane finish problems polyurethane warning Skip! Remaining material to make sure it 's not an uncommon problem, especially applying... A finish that 's been popular in the US for the stain to dry you! Smoother ) areas are shiny and spread a thinner coat well, it s. With applying a fresh one over it that the polyurethane is the most durable of clear exterior.. Called the guy who did my floors and were polyurethane finish problems happy, high sheen to low.! Contains a solvent that could attack the existing coating a landscape builder, helped. Finish that contains a solvent that could attack the existing coating stain and polyurethane to charge another... Two types: water-based polyurethane and each plank meets finish coating my number one rule is “ LAY on! Have the equipment since 1975 wear a respirator when painting or spraying polyurethane with the tip of a.!

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