knot sealer question

When preparing wood for painting [I'm about to do my floorboards] I've been told to use a knot sealer. What is this for?

Thanks

Reply to
neil leslie
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Its a resin like shellac that is impervious to resin that will bleed out of the knots. You just dab a thin coat on the actual knot. 5 minutes that's it. Don't overdo it.

Reply to
Michael Mcneil

And if you've got a manky knot which is going to need filling and sanding prior to painting, when's the best/appropriate time to apply the knotting? Every time I have to do it I ask myself the question...

David

Reply to
Lobster

I sand first, knot, fill and then sand again. If any knot is revealed then knot again and sand.

Then prime and sand, undercoat and sand, top and sand and top....

Reply to
The Natural Philosopher

It is basically shellac. It prevents the sap like stuff penetrating through your nice new paint and leaving obvious brown circles. It would be especially apparent on new wood.

Christian.

Reply to
Christian McArdle

The accent here is especially, as I have had 40 year old wood "bleed" through when not knotted! :-(

Reply to
Broadback

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