You can paint anything.
If you paint it, just keep in mind to try not to mess with the factory sealing surfaces (i.e. where the gaskets are [just as a general precaution]) And also prep, prep, prep. I also used about 4 - 6 coats of clear as I know it will see a LOT of abuse. Have to be careful with this tho, you could put on so much clear that it just peels right off.
So far, that paint job made it through a season of play and came out roses.
P.S. I also put it in the oven for about an hour at the lowest setting my oven could go with the door slightly cracked to get it down to the 140-160 range, just to add an extra hardening factor for the clear. Again, more overkill.