Take time to prepare surfaces properly before you apply new coats of paint. Even during the primer, the yellow would leak through. The knots are hidden at first, but eventually brown colour shows through.” You can see a typical example of this problem at the photo here. But white and light paints can react if clear coated with a waterbased finish; water-based topcoats are reactive and may draw out substances in the wood such as tannins, dyes or … Once you use the white sealer- you have sort of committed yourself to a white paint if you are going to distress the piece. All of these measures can slow or even prevent yellowing of white paint in some instances. Q: “How can I stop knots from bleeding through after painting? ... oil based primer will seal things much better, which should stop the yucky stuff from bleeding through on you. Luckily, there are actually a few different things you can try to prevent those pesky wood stains from bleeding through your furniture paint . So next time you pull out the white paint, make sure you tackle the tannin bleed through first! You can keep dark paint colors from seeping through the fresh topcoat by using a quality stain-blocking primer. The staining even came through heavy coats of oil-based paint. The wood tannins bleed through your paint like the photo above shows. All bright white paint will yellow slightly with time, even without topcoat. More woodwork and finishing tips: Step by step tutorial: How to refinish wood furniture (with minimal sanding) Damp patches, nicotine stains and old oil-based or metallic paint can bleed through fresh paint, leading to unattractive blotches and stains. Paint primer has three functions: Prevents stains and difficult to cover colors from bleeding through the topcoat Grab yourself some shellac and a bottle of clear nail polish, and you have a simple solution for bleed through. The bleed through continued. I then painted over the discolored alkyd enamel with a coat of Zinser Shelac based primer. I've now given it 2 coats of white paint and it's all a creamy color, rather than white. Hi, I have recently painted a room (wall and ceiling) in white emulsion. As for the paint, if the walls were previously painted white, there usually isn’t a problem covering over it with a different wall color without applying a primer if you use high quality paint. The paint looks perfect, but after a day or two, yellow stains start to come through where there was an old partition and on the joins where the wall has been replastered. Moisture, cigarette smoke and excessive cooking grease can all yellow any paint. If you paint over a porous surface, the light colored-paint will appear streaky and uneven as the dark color bleeds through. To be honest, bleed through and wood stains that show through paint are probably one of the most frustrating things that you could encounter when painting furniture. 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