I want to sand the interior of my '52 F3. I already removed all of the trim, gauges, grilles, etc. Would a mouse sander be best to get into corners, grooves, and rounded areas?

 

Sure. There's no rule that says you must use this or that. Whatever you have that makes the job easier is perfectly fine.

 

I found using an angle grinder with paint removal discs to be the fastest.

 

I'm not sure this is what you want to do unless you are trying to strip the paint down to bare metal.

Are you just trying to scuff the paint down for refinishing or strip it off completely..??

--
Gordon

 

Since it's an old car I would think it's a restoration and doing it the right way for me is taking it to metal. Metal-prep then laying on sealer/surfacer base and clear unless he just goes with a lacquer and want to do a quick job.
Just my 2 cents.