Wed, Oct 24, 2007, 4:56pm (EDT+4) (efgh) doth sayeth:
One coat of shellac works well for me. The problem I have is that it
usually takes 3-4 coats of white paint to cover the darkness of the
shellac so you can't see it. I'd like to use something lighter in colour
like a polyurethane but I'm wondering if has the same sealing results of
shellac.

Well, apparently your one coat of shellac "doesn't" work well. If
it did, you wouldn't be asking. I use latex on a variety of my
projects. With no problems. I do use good quality indoor/outdoor. One
coat usually meets my needs, sometimes two. You may want to try a
different brand, and/or better quality. I haven't used shellac in
decades, but do understnd it comes in different shades. You might want
to buy flakes, and mix your own. Anyway, I think it's more likely the
darkness of the knot, and not the shellac, that you want to cover up. I
don't recall you saying what it is you paint. If you want viable
responses, you need to provide ALL the details, not just a few. You
know what they say, "GIGO, garbage in, garbage out".



JOAT
"I'm an Igor, thur. We don't athk quethtionth."
"Really? Why not?"
"I don't know, thur. I didn't athk."