Knotting solution V Stain block

[David Lang]

Got some softwood with lots of knots which is going to be painted.

Knotting solution is expensive, but I have some Stain Block paint.

Anyone tried that on resinous knots? Would it work?

[ss]

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 may work. I used because thats all I had at hand.

[The Natural Philosopher]

I've paid more for a paint brush

Cheapskate.

>

[harry]

It helps if you burn the resin off by judicious application of a blowlamp.

[Martin Brown]

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 put on.

[The Natural Philosopher]

No, they dont. That's what knotting is for.

[fred]

Knotting solution is essentially shellac. You may find this cheaper. I dunno

[David Lang]

No you haven't.

Cheap until you look at the delivery charge. Nearly £10 for 125ml.

I have no other use for knotting.

[The Natural Philosopher]

Buy some from the BM then

Its just alcohol and shellac mainly.

>

[Roger Mills]

Oil based undercoat is just as good as stain block on ceilings - and is probably similar stuff.

But oil based paint on its own won't hide knots in wood. So I doubt that stain block would either.

[Andrew]

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.

[Andrew]

Is that still true with water-based paints post-VOC2010 though ?.