Hi I found an old country sink and thought it would be a nice addition to the new kitchen I am creating(pics in profile). Long story shortened. I turned on the faucet for the first time only to find that it doesnt drain properly. ARGGGGGH!!! The center drain hole is a high spot and about a 1/8 th inch of water pools all around the sides of the sink. The sink is made out of ceratherm(ceramic with glazing). I was considering putting down a layer of polyurethane to at least level the basin. Any suggestions???