NOW I understand. I have one of those. I was thinking of a box miter, and wondered how a shim would work.
I have 3 steel doors that need to be sanded to remove some rust; then repainted. One is plain solid, just light rust. The other two have indented panels, with heavy rust in places. Last time I did them by hand with paper. It took forever. These are not fancy doors. Just outbuildings. I'm looking for fast rather than perfect. Would an orbital sander be a good option? Or just sanding blocks? Or something else?
Searching the web sure puts a damper on forum discussions, doesn't it? I looked at reviews and they're all over the place with the liquid stuff. Don't trust raving reviews. Liquid might be good around the edges of the indented places a sander can't get to. Better than nothing. Not over the entire door, especially if you can't take it down.
Since I started this topic here, I feel I should finish it here. After all night internet search I've decided an orbital sander is not powerful enough, more for finish woodwork. BTW, a cordless one would weigh about 6 lbs with heavy duty battery. Going to go with a regular corded disk sander. Leaning toward this one. Dewalt 6 amps with a side handle. Only 4 lbs. Concerning little crevices you can't reach... I watched Youtube videos comparing all sorts of liquids to remove rust. Only the strong acid ones work, some dangerous, hard to get (muriatic and HCl), and runny. One of the best was Naval Jelly and it comes in a thick paste, so it should stick long enough to a vertical hung door to work. But before I get one, I'm going to run a belt sander over the worst door to see if the old paint (Rustoleum) gunks up everything.
You can get these for your drill at Lowes, etc: They'll fling cleaning fluids, dust, and anything else they come in contact with. Wear goggles & a mask.