The bulb you were interested in would work just fine. 7200K should produce some great results.

I would probably go with 60/40 OF/Perlite, I've seen OF compact pretty badly. And with that, you could likely do almost the entire veg phase and only need to add nutes come flowering time.

Never heard of the paint you're talking about, though I would wager since it would work on a roof, it would work on other rough surfaces, you just need to worry about even application.