I built a table for my outdoor patio. I am a beginner at painting, sealing ect. I applied a coat of Olympic Maximum Clear Waterproofing Sealant. I was told that was what I needed. I wanted a smooth, slick table top. So, I applied one coat, waited 24 hours and sanded with 220 sandpaper. It was still gummy. I sanded out the wood and applied another coat. Am I on the right path? I was going to go get some polyurethane and apply on top of the sealant. Will that work?