Damien, it's good that you were cautious about possible fumes the paint might give off when heated. In my case, the mesh is for ventilation, viewing, and easy misting, not to support a light source, so heat and resulting fumes aren't a factor. As you pointed out, engine paint should definitely be a usable option, though.
Ginevive, that's as clear as the plastic gets, but it really is pretty clear in actual usage. I don't have any problem reading through it, seeing if a bp's eyes have gone blue, or seeing spots on my geckos larger than 1mm or so, and that's as well as I really need to see without opening an enclosure anyway. You CAN get clearer by going with an acrylic container instead, but they're not as scratch resistant, may crack when exposed to heat or pressure, and are considerably harder to work with with drills or other tools.
Rusty, LOL. Nothing wrong with the right rust in the right place and time. :)