Knotting solution V Stain block

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?
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Dave - The Medway Handyman

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On 03/11/2016 23:22, David Lang wrote:

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.
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On 03/11/16 23:22, David Lang wrote:

I've paid more for a paint brush
http://www.powertoolsdirect.com/rustins-knotting-range

Cheapskate.

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On 04/11/2016 04:22, The Natural Philosopher wrote:

No you haven't.

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

I have no other use for knotting.
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On 04/11/16 10:21, David Lang wrote:

Buy some from the BM then

Its just alcohol and shellac mainly.

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On Thursday, 3 November 2016 23:22:08 UTC, David Lang wrote:

It helps if you burn the resin off by judicious application of a blowlamp.
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On 04/11/2016 08:25, harry wrote:

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.
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On 04/11/16 08:54, Martin Brown wrote:

No, they dont. That's what knotting is for.
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On Friday, November 4, 2016 at 9:16:46 AM UTC, The Natural Philosopher wrote:

Knotting solution is essentially shellac. You may find this cheaper. I dunno
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On 04/11/2016 08:54, Martin Brown wrote:

Is that still true with water-based paints post-VOC2010 though ?.
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On 03/11/2016 23:22, David Lang wrote:

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.
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On 03/11/2016 23:22, David Lang wrote:

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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