Christian McArdle wrote:

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?


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.



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

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