brake caliper bolt

so i have a bit of a problem...i was trying to change my brake pads and rotor on my 1995 325i. The rear passanger side bolts that hold on the brake caliper are stuck and i can't get the bolts to come out. I think that the hex is rounded because i can't get a good grip..any ideas on how to get those undone in such a small space?? I did use some anti seize gel when i put them back in but that doesn't seem to have helped.

I don't know how much this will help, but try using a hammer to knock a larger hex into the hex slot on the bolt. This worked when I stripped the bolt that holds the rotors on.

MEH