applying a finish over an existing one


Hello - I just bought new barstools that swivel and somtimes when they do (swivel) the wood part bumps my granite counter. I would like to protect the wood from getting banged up by applying a good finish over the one I have. I don't know what the existing finish is on my barstools. What will happen if I apply, say polyurathane over lacquer? Any suggestions on what to do? Thanks in advance!
Yvette
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The two are from different families but in the instance you depict the poly will go over the lacquer with no difficulty. Obviously I'd verify this in a small obscure area.
On the other hand, lacquer over the poly, the lacquer would attack the poly and could give you a wrinkle finish.
Don Dando

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No finish is going to keep the wood from getting banged up if the wood keeps hitting some granite.
That being said, putting polyurethane on top of lacquer is risky. Polyurethane sticks by a mechanical grip. It will not burn into the existing finish. If you feel you really need to do this, clean the barstool really well, apply a coat of dewaxed shellac, sand lightly, and then apply some polyurethane. The shellac intercoat will help with adhesion as will the light sanding,
Good Luck
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