i have seen Sky's brackets, i see them every time i open my garage door. they're hanging off the wall.
spacers = longer bolts = more stress on the bolts = more chance of breaking
my brackets are raw, no coating of any kind, and they show no signs of ever being heated. at any rate, they'll never get hot enough to bend, and if they do, you've got bigger problems to worry about than how the bracket was manufactured.