Actually I've used my Ryobi clone to cut an exhaust pipe off my Acura.
Used the glass reinforced disc however as those thin discs shatter.
They're useful for finer work, thinner cut.
Now I'd probably use my RotoZip with the disc attachment.
I've done something like the comercial shows. I think it was cutting
some protruding nail heads flush with something I didn't want damaged.
I then set the shanks with a small set and filled in the holes. Someone
had "repaired" this piece with 4d nails I replaced them with screws
countersink beneath plugs.
Richard