Ronseal RSLKBPU25L Knot Block Primer and Undercoat, White, 2.5 Litre

Product Information

In this section, we'll discuss some key points to keep in mind when working to prevent knots from bleeding through paint.

Although all paint primers are supposed to perform the same primary function, some differences exist. Here are answers to some frequently asked questions that may provide additional help when selecting and using paint primers. Q. Should I use an oil-based or water-based paint primer? Water-based primer is best for walls and ceilings. Oil-based primer is primarily used for doors, windows, metal, woodwork, or over tough stains in well-ventilated areas. Q. Which is better: primer or paint with primer? Paint with primer is best for previously painted walls. Primers are recommended for use on any surface that has not been previously painted. Q. Do I have to use paint primer?Bare wood: Apply an oil-based or latex primer to wood that has never been stained or painted to help seal the porous surface. Keep in mind that oil-based primers tend to emit more VOCs (smelly pollutants) than do latex primers. A: This is a very common issue and you can see a typical example of it in the photo above. In this case the staining even came through heavy coats of oil-based paint. There doesn’t seem to be any amount of paint that can stop this, so what can you do? The issue is especially big with softwoods such as pine and spruce.

Now, how to do convert wood trim and cabinets to paint…we have it all covered for you, not literally! For mold, first, of course, you need to kill it, using a powerful mold killer (comes in spray bottles too), and then when dry, apply a Mold Killing Primer in any place the mold might grow. Finally, add Paint-Guard a mold-inhibiting additive to your topcoats of paint. Always wear appropriate PPE, including safety glasses, gloves, and a dust mask, particularly when sanding and using chemicals like primer and paint. The knots might not come through, but would still be seen as round imperfections, but not the difference in color: that would all be made the same by the primer. This is one of the most critical steps to stop knots from bleeding through our paint. We need to apply a shellac-based primer like Zinsser BIN Primer to cover the knot. Latex primer will not stop the knot from bleeding through our paint.Despite taking necessary precautions, you might still encounter some issues with knots bleeding through paint.

The BIN spray can is good for any small extras you did not get the first time, but you have to be careful with overspray: it does not come off! As to your question, always do a test sample. Find some knotty pine, treat it as you did the fireplace and do some testing. The bottom line is whatever you are happy with is what is good. If you want to use a water-based product, look for a high-build acrylic-latex enamel undercoat that’s specifically designed to be sanded. All the wood comes from a bed manufacturer and is measured, cut, and pre-drilled ready for assembly. It is all raw Spruce wood from the Pacific Northwest and arrived sanded and ready for finishing. It’s a soft wood and does have knots and sap streaks. A: Water-based primers are generally not recommended for sealing knots, as they may not provide sufficient protection against bleed-through.Debbie Wolfe is a photographer, author, and freelance writer in various niches. She has contributed hundreds of home, garden, and crafting articles and DIY tutorials for leading media outlets and retailers, including HGTV, Real Simple, Forbes Advisor, The Spruce, The Home Depot, Walmart, and Mother Earth News. She is the author of two DIY books: Do-It-Yourself Garden Projects and Crafts and Crafting with Herbs from Skyhorse Publishing. Her testing approach is straightforward and budget-minded. Hope this information helps you make a recommendation. Sorry for the long post! Appreciate your time to read it and reply if you can 😊

If you get into a situation that won’t cover with a traditional primer then before you paint, apply a coat of one of these primers. If after 24 hours you don’t see any bleed through then you should be good, but you need to give it some time to fully dry before assuming your coverage was successful. No, but using a paint primer does reduce the amount of top coat paint needed, and it protects and seals the surface. Why Trust Bob VilaKILZ Original Oil-Based Primer:A popular choice for professional painters, this primer effectively seals knots and other imperfections in wood surfaces, ensuring a long-lasting, uniform paint finish without bleed-through. While there may be no issues currently, bleed-through could still occur over time if a primer was not used initially. Bonds to glossy surfaces without sanding; easy to apply compared to some other options on the market Water, mold, and rust stains are tough to cover, but odors are even harder to conceal. Smoke, pet urine, and food odors often require using an oil-based or shellac-based primer to seal them into the surface before painting. However, Kilz Restoration interior primer offers the same performance as oil-based primers but with the easy cleanup convenience of water-based paint. Wooster Brush Alpha Angle Sash Brush:This premium-quality paintbrush features a blend of synthetic filaments, designed for smooth and even paint application. By using a high-quality brush like this, you can minimize brush marks and create a more consistent finish when painting over primed knots.