I have been looking at tutorials of putting resin on tumblers and water bottles. Most have you put tape on the top and bottom but with my wine tumblers they don’t really have and edge to do that. So I did one coat and it worked great. There were only a couple spots where the stickers in the cup made the resin not go in certain places. Because of this, I did a 2nd coat, but brushed the the opposite direction I did for the first coat. However, going from the top of the cup to the bottom of the cup has now created an ugly line at the top. You can see in the cured resin where I started with the brush strokes. What do I do to fix this? Can I sand it and do a third coat?