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 Post subject: BLEEDING KNOTS - WHY ?
PostPosted: Wed Sep 20, 2017 11:29 pm 
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My skirting boards were treated with `knotting` approx. 4yrs ago & recently
noticed the knots have bled leaving brown marks: used water based primer/u.coat followed by 2 coats of water based `Crown Satin`. Any Pro - Decorators advise, Thankyou.


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PostPosted: Thu Sep 21, 2017 9:44 am 
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Depends how bad they are bleeding really. You could get away with scraping back the knot bleed, cleaning with meths and applying a coat or two of shellac based primer, ie Zinsser BIN.

Worse case scenario could involve applying heat to the knots and scraping back until all the resin has gone, and then applying the primer.

If they are just brown marks, touch up with the BIN and you should be OK to repaint.

Knots are a law unto themselves really, and even with a good few applications of knotting solution can bleed or stain through.

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PostPosted: Thu Sep 21, 2017 10:14 am 
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As fitzy says, but if you're applying heat to knots, wear safety specs, as I've seen resin pockets exploding/popping. Its rare, but stay safe.

Permanent solution is to drill out the knots and 2 pack fill them.

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