You can buy Fluid Film at Canadian Tire in the Automotive section. It will be in the same area as WD40, penetrating oil, spray lube, etc. You can also buy it in 20 liter pails at NAPA for undercoating and rustproofing your car, which lots of people do because it is a very good rust proofer.
Fluid Film is all I use on my antique firearms now, some of which don't have much original finish left. Getting them damp in the field doesn't cause me nearly as much problems or stress as it used to.
