There was an NTSB report last year concerning the crash of a Safari homebuilt helicopter. The cause was a powder-coated cyclic control stick fracturing.
On a personal note; I have seen several aluminum rims that were powder coated fracture at the dragstrip. Some people have good luck with the process and some don't. In any case it is not something I would like to have in the back of my mind while I'm flying my plane down the backside of a loop...

Chris