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At some point we're going to start decorating our new house, and the previous owners clearly whacked on gloss paint on new skirting boards, doorframes etc without using any knotting solution first, so the knots are starting to show through.
When we repaint, do we need to sand back to the raw wood and apply the knotting stuff, can we put the knotting stuff over the existing gloss, or will the existing gloss have done a reasonable job of sealing the knots now anyway, so we can just paint straight over it?
Back to the wood in my experience otherwise it just travels along the old paint layers
Back to wood probably. I would not recommend Colron brand though. After fitting 8 door frames worth of arch last year and knotting the lot before painting, some of the large ones are already bleeding through.
E: I’ll probably B.I.N over them if I can ever be bothered to touch them up.
You might want to put a bit of Zinser Bin over the knotting gunk once it's gone off.
Back to the wood in my experience otherwise it just travels along the old paint layers
I suspect this is why there were 17 layers of gloss on the skirting in our house when we moved in 🙂
What's B.I.N?
it's zinser's shellac primer
Zinser BIN. 1 or 2 coats - test a but first. We moved into a house with all the joinery stained dark brown. Light sand, 2 coats Zinser, 2 eggshell and all looks good a year later.
You can get a good headache if you don't keep windows open though!
Back to wood.
The knots are high in resin which the solution helps stabilise preventing bleed through. It won't get to the wood if there is a coat of paint on.
Yo might have to stand carefully and feather as otherwise the variation in thickness will be visible.
After that you'll need to reprime. Best bet is to follow manufacturers guidelines. They will test their products together and know they work. Less confidence mixing manufacturers. Might be Ok in decorative bit is normally forbidden in industrial specs.
I gave up with knotting solution on our front door and drilled out all the knots, filled with two part filler and painted over.
[url= https://live.staticflickr.com/65535/46944958955_96c722b9b6.jp g" target="_blank">https://live.staticflickr.com/65535/46944958955_96c722b9b6.jp g"/> [/img][/url][url= https://flic.kr/p/2ewnbL4 ]Front door[/url] by [url= https://www.flickr.com/photos/brf/ ]Ben Freeman[/url], on Flickr
[url= https://live.staticflickr.com/65535/33983871828_3a0228548f.jp g" target="_blank">https://live.staticflickr.com/65535/33983871828_3a0228548f.jp g"/> [/img][/url][url= https://flic.kr/p/TM3e7C ]Front door[/url] by [url= https://www.flickr.com/photos/brf/ ]Ben Freeman[/url], on Flickr
My neighbour used to flog paint products for one of the big manufacturers. He said that no one makes a foolproof knot-block product and it's not worth the hassle.