I used the 303 per instructions on the bottle (didn't apply using a paintbrush as suggested on here) and it made NO improvement. Not a single bead of water on the top at the next rainstorm. Applied liberally to a clean, dry top, then parked in the sun for a few hours to "cure". On another forum I read a similar complaint so I'll contact the company. Maybe a bad batch?? Of course, now El Nino has started up out here so It'll be a while for a clean dry top again.
