You mentioned it will feel rough. What I have is smooth. I looked at the pics. The manufacturer mentioned on the site and the video (which has been removed) is who I am dealing with. Do you think it's possible that I have a gelcoat issue? They want us to buff it off.... I'm wondering if I this will remove some of the gelcoat ...which will consequently remove the white stains which they claim may be CaCl on the gelcoat.