Friday asked Rick Gualtieri:

Warning this is an annoying geeky question, what about sunlight harms vampires in your canon? Sunblock is UV opaque, so is plain glass, but clouds are not. Sunblock and glass don't block "light", but clouds seem to. Bill seems to be safe, while totally unprotected under cloudy skies, but needs tinted glass and sunblock for clear weather. Is it some mystical property of the "light" of the sun, the UV or what?

Rick Gualtieri Bottom line for Bill is that he has no freaking clue. However, there's something definitely mystical about it. Even Dave has been forced to conclude that there are portions of Bill's anatomy (get your mind out of the gutter :) that seem to defy known scientific logic.

Also, Bill's experiments on such have been anything but controlled. Keep in mind that even when he's wearing sunblock on a sunny day, he's also always wearing some hooded clothing. I don't think he'd be insane enough to, say, go to the beach just relying on some Coppertone to keep him from turning to dust.

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