My husband and I, who are very new to home improvement, recently made a bathroom counter with inlaid sinks from concrete. Everything turned out great, however now that we hooked up the water we noticed that a little bit of water stays on the bottom of the sinks. It doesn't drain because the edges of the drain stick up just a little bit higher than the bottom of the sink. Is there some type of product that can level it out,maybe some typy of clear plastic that we could put around the drain to even things out??