What I have done in the past on a white emulsioned ceiling (water
stains/damage) is give a couple of coats of white gloss and then
emulsioned and it appeared to work ok.
So maybe a couple of coats of gloss on the knots before the undercoat
I used because thats all I had at hand.
That might work - at least leaving some room for it. A lot of modern
timber knots are absolutely soaking in fresh resin and will ooze the
stuff through a paint surface no matter how much knotting compound you
I just use a hot air gun and boil as much of the resin out first.
It's only (normally) a problem on external south-facing timber.
Isn't knotting solution just shellac ?, in which case you can buy the
powder and make up your own.
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