shellac doesnt' work for killing knots?
I read that someone here hasn't had good luck with shellac killing knots?!?
BIN is a white pigmented shellac, and has always worked on every knot
I have applied to it. I also read someone say it takes 2 years for knots
to fully cure, I have painted over wood that was lumbered 50 years ago, and
the knots are still 'active'. What you have to understand is that in order for
a primer to kill a knot stain, it has to polymerise - another word for dry - before the tannins can bleed thru. And BIN being Alcohol based, dries the fastest of any of the 'quick' dry primers. Although lately is seems, that some manufactureres and paint stores are saying shellac based primers are 'old' technology. And are now pushing quick dry primers formulated with Vinyl-Alkyd Toluenes, such as California's Wipe out primer, or Ace alkyd Stain Halter.
And Pratt and Lambert's odorless stain killer, for exterior work especially, since Bin is very sensitive to moisture. Although, I have experimented with Applying Pratt and Lambert Accolade paint to wood previously done with poly, without priming. And the poly killed all the knots great.
-PlainPainter