Annie Sloan chalk paint bleed through beaten
Updated from 2012 Tannin or resin from leaky knots will bleed through water-based paints that have no stain blocking ingredient. Annie Sloan chalk paint may therefore suffer from bleed through. That is just the way it is. But never fear. Annie Sloan chalk paint bleed through beaten.
The solution – from Annie Sloan’s site
With some pieces of furniture, typically pieces from the 1930s and 1940s, after painting the first coat there is either a yellow or pink stain which bleeds through the paint. No matter how may coats you paint, the stain colour will continue to bleed through.
The ANSWER is to get something called *Knotting or sometimes it is called shellac. Get the clear one and apply it using a pad rather than a brush. It dries in minutes and you can get on with painting immediately!
( *it’s a natural product from an insect in South East Asia, using a resin deposit that the insect extrudes to help them stick to trees. Strange but true!)
Clear shellac knotting
Yes, the lac beetle is a strange beast which isn’t oozing quite as much resin as it has in the past. The prices for shellac based sealers have been sky-rocketing. (This is a taste of what shellac is used for.)
Clear knotting or “white knotting” is bleached shellac, and is essential if spot sealing the occasional leaching brown stain. It will dry a pale shade of honey and the subsequent dabs of chalk paint will cover it fine. You can get International from B&Q type places, Ronseal do one.
Patent knotting is the dark brown shellac. You should avoid this when dealing with bleed through on chalk paint, because it will take a lot of covering.
A boy decorator’s solution to Annie Sloan chalk paint bleed through
Styptic knotting is “white” knotting, but styptic sounds a bit more “craftsman-like” than plain knotting. Styptic is a professional decorating product as traditional and old as the hills!
If you have lots of bleed through on chalk paint to heal, I wouldn’t dab, I would seal the whole surface with knotting!
After the first coat of chalk paint, this door panel was stained in several big patches. So rather than be selective, I painted it all again with styptic knotting, and waited a couple of hours before over painting. What you see is one coat of chalk paint nearly finished.
Trust chalk paint ahead of knotting
I would definitely advise against over-thinking the bleed through situation. Don’t take the normal painter approach of trying to seal knots or dodgy surfaces before you apply the first coat of chalk paint. Follow the Annie Sloan mantra of no prep, let the first coat of chalk paint find the weak spots, and if required, seal over the bleed through.
Some more tips on knotting for chalk paint bleed through
Technically you should lightly abrade a coat of knotting before over-painting it to provide a key. It is very shiny, but this is chalk paint, so who needs to rub down anything to make it stick!
One or two coats?
I was taught to apply two coats of knotting, the second one for added peace of mind. The second coat has to go on very quickly with no fussing, as knotting is a reversible coating. So if you apply shellac paint over itself, the solvent in the topcoat softens up the coating beneath. This reversibility is a pain, but it has one advantage in that you can constantly revive brushes used in shellac paint simply by dunking in shellac-based paint.
Do you need 2 coats of knotting in this situation?
I didn’t think it was necessary in this particular situation. But other times, you are best advised to coat twice for belt and braces.
Does knotting cure all bleed through
Yes, but no, but yes but…
Ordinarily, yes, knotting is a bombproof solution to staining, but sometimes a weepy knot can bleed so badly that the resin will lift any coating, even shellac-based products. In direct sunlight, knots can be kept active indefinitely!
Knots that are scuzzy, but have stopped exuding resin, you can wipe over with a rag soaked in meths to clean away old residue. Seal twice.
Very bad knots can be drilled out and filled.
What is Zinsser BIN?
Zinsser BIN is pigmented shellac, providing knotting and high adhesion white primer in one. A full article on BIN paint in aerosol cans and alternative ways to apply BIN.
Is BIN suitable to stop bleed through?
Yes, but only if you apply it over the whole surface first. If you are touching in spots or small patches, BIN is not a safe choice in that it will probably show through subsequent coats of chalk paint.
If you spot-prime bleeding patches with 2 coats of BIN using a brush, and over-paint with chalk paint in any colour other than white, you will probably see the white sealer through the chalk paint. I say probably, because it didn’t happen on one example I show elsewhere in the site, but I think the BIN was sprayed and the edges were nicely feathered. And I was lucky?
Therefore, if spot sealing, follow Annie Sloan’s advice with clear knotting. Apply with a pad on random bleed through, making sure to feather out the edges to avoiding ridging. And if staining is widespread, my advice is to reduce work, stress and thinking by simply applying clear knotting on complete sections, and leave the Zinsser BIN alone.
Want to know more about chalk paint?
If you have any other questions, head over to the forum section covering chalk paint and furniture painting. A few of the other Traditional Painters I work with will have something to say, I am sure.
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