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Dewaxed shellac for knots

I meant to seal the knots on my trim with dewaxed shellac/sealcoat before priming and painting to prevent bleedthrough, but I got ahead of myself and primed already. Will going over the primer with ...
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Is the Zinsser BIN Shellac primer sandable?

We are preparing to prime kitchen cabinets that had past nicotine stains, and want to completely block any future bleed-through of those stains. We hesitate using the Shellac because we aren't sure ...