Knotting Solution?

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I have stripped the paint off old woodwork, from 1930's, and also from wood about 20 years old and will be painting the wood again. Can anyone advise whether I still need to use knotting solution? It does seem to be very expensive. Many thanks for any help.
 
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Depends on how many knots, as to how expensive it works out;) Google Zinnser paints - you'll find one that seals knots and acts as a primer too :idea:
 
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£5.59 at Screwfix. But you probably only need a very small amount. The rest could be used as a stain blocker elsewhere though.

As Nige F says, you could use Zinsser BIN instead. It is basically shellac suspended in alcohol with white pigment added to it.
 
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Thank you both for your answers. The wood I am painting is just the skirting board around a room 13' x 11', plus wood around door and window. I found some old answers on here recommending Liberon knotting solution (from Screwfix) and as the final coat of paint I will be using is very light, I think I will go for that. I also have lots of primer/undercoat already so in the present financial situation (!) I will have to use that. Thank you both again for taking the time to answer this.
 
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You can get knotting solution from screwfix and wickes for a fiver.
You only use is on the knots themselves, and sparingly.
It lasts ages.
Personally, I'd rather spend the fiver and not see the knots bleed through my lovingly-prepared and glossed woodwork.:)
 
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Thank you Brigadier for your reply. Yes, I bought the one from Screwfix and, as you say, I'd rather use the solution than have the final coat of paint spoilt. Many thanks for replying.
 

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