Some people use nonstick for HP soap, just be SURE the lye is completely cooked out of it first. I'd be tempted to err on the side of caution and not use it for either.
i use a nonstick breadloaf pan, but really it has nothing to do with the nonstick part. i line it (have been using press-n-seal lately, works great), so the soap does not actually come into contact with the teflon and/or metal
you can use anything. was noticing in one of the soaper's pix, a bunch of pizze hut boxes. my first impression was they must really like pizza hut, but realized they were using them for molds lmao
sometimes it takes me a little while to get the engine started