When tiling the bathroom, I cut the door frame higher up than I needed to and now have a large gap. Please advise the best method of filling this gaps so that it looks professional. Some choices - 1. Caulk - easiest, but wont be flush and I believe will look tacky 2. Cutting the frame higher up and adding a new piece of frame. This will look better, but will take time/effort. Is there a filler that can be moulded/sanded and then painted and that is waterproof?