Drilling into / through the top
I'm getting ready to mount my solar panel, and later a roof rack.
1) When drilling through the top to mount angle-aluminum, is there anything I need to watch out for? How do I avoid cracking the fiberglass - gradually increasing the bit size? Tape over the hole? What tips do you all have for me?!
2) When mounting roof racks (such as Yakima), how do you secure them? Are they drilled into the top, and if so, are they through-bolted or self-tapping screws into the top?
Thanks very much!