You will have to sand it off or remove with a chemical. You might have to repaint or stain it and then when you are ready for the top coat - use only water-based polycrylic, it will not yellow and Minwax makes a great one in a blue can.
How old is the piece of furniture? A shellac finish will dissolve in alcohol. I've stripped a varnished floor with ammonia (not a process I'd recommend, but it can be done). Try a small, inconspicuous section first.
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You will have to sand it off or remove with a chemical. You might have to repaint or stain it and then when you are ready for the top coat - use only water-based polycrylic, it will not yellow and Minwax makes a great one in a blue can.
http://homeguides.sfgate.com/quickest-way-remove-varnish-stain-sanding-45220.html
How old is the piece of furniture? A shellac finish will dissolve in alcohol. I've stripped a varnished floor with ammonia (not a process I'd recommend, but it can be done). Try a small, inconspicuous section first.