How to cover up yellowing cabinets?

Pelk Al
by Pelk Al

Last year I painted my kitchen cabinets with white chalk paint and then put 2 to 3 coats of satin Varathane over them. Now they are starting to yellow. I have decided to re-paint them with white oil based paint. My question is...do I need to sand off all of the Varathane first? I am worried that the yellowing will eventually seep thru the oil based paint if I don't sand it off. Thank you for any help.

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