Originally Posted by HardyWeinberg
That's a good one. I think it's worth replacing bolts that don't go all the way through w/ longer ones if needed, also. (like, through rack, fender, and all the way through eyelet, but not so far as to hit moving parts obviously). You want max thread engagement.
If you are buying fasteners for your bike at the hardware store, get the stainless ones. Also, the nuts with the nylon inserts are good to prevent loosening.