Well I’ve done it now! Hated waterline fiberglass pool tile so I removed it. This was an add on and applied with some kind of caulk that separated from tile to tile and was hard to clean beteeen. Now my waterline is damaged(by me) from scraping all off. Can I lower my water, sand, clean with acetone then gel coat just about 10” ? DIY as no funds for professional. It’s all white pool so no color mixing. Thanks in advance for any help