The best time to go through your stuff is right at the end of the season; that way you'll have some kind of a handle on what needs to be done. This December I went through my rifle-fixing kit and discovered that my foil-wrapped oil wipes had all dried out, and that my cleaning patches were of an off-beat and worthless size since I'd used up all the good ones. I had a Sure Fire flashlight whose batteries were heading south (and when those batteries go, they go fast), and the alcohol wipes in my first aid kit had dried up. The Barge Cement that I use to repair holes in rubber-bottom boots had dried to the consistency of asphalt. There's nothing half as good for that kind of repair, but once you open a tube, its days are numbered.