A dremel has a very small sanding drum. The air filled are larger and will give you smoother edges. I use a dremel for small touch up spots, but more with a burr though and not the sanding drum. Janet, do you have a bench grinder? I buy the flexible sanding drums from either Robert's Studio or Seyco and slide them onto the grinder shaft. They work great for the shaping (80, 120 grit) and then finer sanding (180, 220 grit).