I've got a bit of rewiring to do in some tight spots (porch lights).
12-3 solid wire is always such a pain to work with I was thinking of using some of the rubber coated stranded wire (still 12-3). In the past I've used that extensively outdoors. Is there any reason to not use it in wall for short runs?
You can't use rubber coated service cord or the like (SJ, SO, etc.) in wall. You can use a conduit and pull individual stranded conductors (THHN generically, most these days meets a lot of different specs.).
As long as it's properly rated and not just grabbed from extension cords, etc, that would be OK. Just be sure to get the real thing; it's usually right next to the solid wire on the store shelves with other residential wiring.
I don't think you want stranded, though. If it's tight spaces, you're going to wish it was solid when you try to finish the installation and be certain all the strands made it into the connection (wirenuts, etc.). When we lived in Chgo I rewired a home with conduit & stranded wire salvaged from a factory and I had to tin-solder each end to get it to easily install into wirenuts & attach to fixtures, pig tails, etc..
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