Make sure your refrigerator door seals are air tight. Test them by closing the door over a dollar bill. If you can pull the bill out easilly, the latch may need to be adjusted or the seal may need to be replaced.
Saw blades should be stored separately. Keep each blade secured between two pieces of plywood, fastened together by a nut and screw that goes right through the center of the blade. Blades that are chipped, bent or in any way damaged are discarded at once.