Help! I put varnish on top of polyurethane
I'm finishing a staircase and I goofed. The trim has been stained and I applied one coat of Varthane satin oil based floor polyurethane. The next day I goofed, and I applied a coat of Pratt and Lambert gloss varnish. What do I do? Sand off the varnish? Put a coat of polyurethane on top of the varnish? Thanks for your help.