A coat of shellac can be placed over polyurethane. You should use de-waxed shellac if you plan on placing more polyurethane on in the future.
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Yes, you can put polyurethane paint over eggshell in latex or eggshell in oil.
Yes
Yes, as long as the polyurethane is oil-based.
Can you put stain in polyurethane to darken the color?
yes