I bought a 2009 Ninja 650R from a place in Orangeville back in 2009. Unfortunately I crashed it the first day I got it. I had it repaired and was back on the road within a month. While doing some work I found some rust spots. I brought it back to the dealer and they claimed my paint must've chipped off due to the parts being "tweaked" in the crash. I decided to ignore it and rode some more. Meanwhile, I still had some cosmetic damage so I ordered several OEM Kawasaki parts from Thailand because they were 1/3 the price of here and they were brand new, OEM parts (the bikes are made in Thailand). So I decided to replace those rusty parts at the same time. Well guess what? The new parts had rust in exactly the same places, along the welds, mostly. Seems to be bad QA going on there.
I was using ACF-50 rust spray since the first season because I occasionally rode it in winter with salt on the ground. Never saw any additional rust show up on the bike. I parked it under a cover in the backyard all winter and left it parked out on the street all summer in the rain. Never washed it, either. Just a wipe down with Pledge on occasion. Looked almost new when I sold it last year.
Every mechanic I took it to thought it had some kind of crazy leak somewhere, though, because of the oil spray everywhere, lol. If you want some I buy it in bulk and sell it at no profit for me.