3 - Paint over the knotholes (just in case the poly is not stain-proof) with alcohol-based shellac primer. After allowing the foam to harden and cure sufficiently, you can paint it any color you want to ensure that it blends with surrounding surfaces. Below you will find information on how to paint over wood surfaces, including polyurethane, varnish, & shellac. Yes, you can paint latex paint over polyurethane stain after applying an oil-based primer. And while I like nice wood, having 100% knotty pine is a bit much. Step 7 – Polyurethane or Wax Over Chalk Paint (or skip to OPTIONAL color washing) You may want to use a wax and if so, please follow the manufacturer’s instructions. You can use almost any type of paint on polyurethane. The fireplace was also done...ugly dark red brick...see photo. Paint thinner [for cleaning up mistakes, messes and brushes] Common Mistakes: 1. It was built in 1979, we love everything about the house but the walls. Before you start any paint project, you want to ensure that the surface is clean, dry, and dull. Suggestions on how I tackle this project at this point considering we have two layers of den and two layers of latex paint and the amber color is coming through just like we simply did a white wash. I’m still unclear on two items David Jensen: should the knotty pine be sanded before applying the BINs? Applying one or two coats of polyurethane to a painted surface is a recommended way to protect the paint. Let the wood air-dry before proceeding. Need to know what I have to do to paint over the polyurethane on some of the walls. I have a similar situation to the OG poster and others. Then primed with bins stain block.I think I hit the knots the second time with bins.Then two coats of paint.A year later no bleed through and it looks real nice.BTW, Do not use a high end brush with Bins, Just toss, it is almost impossible to clean. Though the paint is thicker than latex, then it does not always cover 1 jacket. Otherwise you will have your surface starting to yellow a little sooner. It helps in my decision to paint or not. It has all the info you need. How to Paint Over Varnish, Polyurethane, Seals and More Without Sanding. Scrub the walls down - a nice mix of dish soap and vinegar will cut any grease. For the grooves in the paneling, use spackle to fill in gaps and allow it to dry about two hours before sanding. Does anyone have experience using this product on knotty pine? Coating over an old finish has the great advantages of avoiding the always-messy stripping process and greatly reducing the amount of work involved. I had no idea about the TSP, and will def opt for the other - I’ll have to see about using a sprayer, but I’m thinking I’ll be doing this by hand. First, rough up the surface of the paneling with a pole sander that has been fitted with a sanding screen (rather than paper). Sikaflex Construction Sealant and all of the Sikaflex polyurethane sealants are paintable after cure. Apply a second and even a third coat until you have achieved the effect you want. ... Run a damp tack cloth over the floor to pick up what the others have missed. Always read the labels, as many oil paints, stains, lacquers and varnishes are extremely toxic. Personally, I don't find the gaps objectionable if they are fully painted. It is very likely that you will be using a chemical to etch the polyurethane. Can you put polyurethane over chalk paint though the paint is a bit thicker than latex then it does not necessarily cover 1 jacket. Curing typically takes 5 to 7 days, depending on temperature and humidity. Many paper towels required to clean up the mess. I am overwhelmed by thought of sanding the whole interior since the whole 2500 sq ft is COVERED with it--or do I just suck it up? Apply a second coat of the primer. Always stir, rather than shake. I did not sand. Answered. Since a friend is doing this as a favour I really dont want to mess up his sprayer. Quite unattractive. mineral spirit doesn't touch shellac, and alcohol does not touch oil paint. Go a step further and apply a clear polyurethane over the painted surface to help protect the paint, as well as the underlying wood. Even then, it's a risk. Use denatured alcohol to clean your sprayer if you are using BIN. My big fear is the contracting and expansion. Any suggestions on the best way to prep and white wash? On very dark paneling, I would go around twice with the BIN, completely blanking out the dark wood. I actually don't like TSP for general cleaning. Which often provides a harder finish than latex-based paints start by cleaning the surface and filling in any tannins,... Poster and others DIY project or if it is these qualities that make a commission. 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