Can polymorph any object be used to transmute mithral armor into living steel armor

[Rogar Stonebow]

And vice versa?

[Crimeo]

Quote:

This spell cannot create material of great intrinsic value, such as copper, silver, gems, silk, gold, platinum, mithral, or adamantine.

Since living steel is vastly more expensive than copper or silk per pound, I'd say pretty much objectively no.

[Tiny Coffee Golem]

Possibly, but even so it's a permanent duration and thus dispel able. If that's a concern for you.

[Rogar Stonebow]

It's not, thanks for the input.