It's been raining a lot here, and I stupidly allowed rain water to accumulate on the top of my Obsidian Black Roadster and let it sit there for a few days in the garage. It looked pretty innocent -- little beads of water all over the hood and rear deck, and since the Roadster is a very flat car the water really won't run off unless you wipe it off. The weather finally improved yesterday so I took the car to a detail shop to have it cleaned... anyway, the beads of water turned out not to be so innocent and there are now water spots etched all over the hood and rear deck. Who knows what was in that water, obviously something that is not friendly to paint. Buffing, polishing, and re-coating the whole hood and rear deck will be the only way to get the spots out, and not something that I want to repeat too often I don't think. Lesson learned: dry your Roadster off when it gets wet! With lighter colors, however, you probably wouldn't even notice it. So if you have a white Roadster, you can ignore this advice.