Sorry for the dumb question, but I have some brake paint on the way. What are the 6 point bolts on the caliper for? I imagine they're to keep the two halves together and I probably shouldn't touch them for painting (just mask and paint around them)? If I'm going to pull the pistons out and regrease them anyways, would it be OK to remove the bolts as well?
They hold the two halves together. You can opt to remove them prior to paint, or paint them with the caliper not split in half. I would avoid painting the heads regardless, the paint will chip off the second you put the e-torx socket on, even if you taped over everything.