All fasteners are stainless steel 304 grade and will resist rusting for many years of use.
If rusting is a problem, try to get some penetrating oil on the threads. Allow the oil time to work (24 hours or so) and then try to remove the screws. It sometimes helps to hit the screw head with a hammer / punch to loosen the screw before using the screwdriver. Use a good screwdriver bit that fits the screw head when it comes time to remove the screw.