i haven't but wanted to just say be very careful if you put a machine of any kind on there. I screwed up my wings somehow. and they're thicker than the firewall. firewall must only be .016"
that being said, looking back, I'd definitely polish the firewall. I just waited too long.
I was joking with my dad yesterday. I said, since we removed the Blue Mountan and sent it back, I was going to pull the engine and remove the engine mount so i could polish the firewall while I was waiting.
mark
To make his/her RV a bit different and more custom than one without a polished firewall I guess.
Personally I like seeing the attention to detail some builders put in.
We were looking for a product to clean up a stainless steel sink and were told that lemon oil works very well. Must have a lot of acid in it which would worry me on an airplane as far as getting it onto other parts - especially aluminum. I would say test it on another piece first.
I polished the stainless firewall of my F1 Rocket. My web site has the pictures and story. I bought a stainless polishing kit from Caswell Plating. That stainless is hard and requires a lot of elbow grease.