By far the one I use most is a 3m sanding sponge, the one with multiple grits on each side, and lately the longer ones. Just amazingly flexible tools for shaping wood and foam, as well as the cleanup work I had to do on a fiberglass fuse... the way the stiff sponge will follow an inside or outside curve is terrific. My secret to making it work fast is, I play a CD of Latin/lounge bongo music while sanding, and the rhythm of the music takes over... by the time the CD is done, so is the job.:-)
My second-favorite tool is this little AC-powered handheld hot-wire cutter I bought for like 20 bucks at the Fomebords store in Chicago like 22 years ago. Now I'm really into bluecore and fan fold, I use it more often than my xacto number 11.
