Bottle ceramic, It's a no brainer if the paint is already looking good. Get it clean to start, no oxidation, follow directions, apply using good microfiber cloths and towels once or twice a year. It's Not better or equal to the professional application but the shine and beading is just as good. After the first application it goes on easy in sections. I used it on every vehicle I own and it gets a 5 star rating. Just a matter of cost and choice of upkeep. Two days for the first coat on the RV, after that 6 mo. or 1 yr, 2-3 hours. 30 minutes for each (4) cars and Dually twice a year not counting the wash. I use a brand off the internet that had good and bad reviews, bad ones because the directions weren't followed. You only want to use a little product when applying. I also had to buy a better spray container because the ones they sent were not very good.