I have a rusty M1889 kürassierhelm shell with brass trim that I'm planning on restoring. It's brown and lightly pitted everywhere so I am considering using evaporust on the whole helmet. The inside is as bad as the outside so I plan on either dipping the shell in a bath of regular evaporust or using the gel formula with plastic wrap. It claims to be safe on brass. Can someone please share their experiences with evaporust products on a helmet? I will be buffing and polishing the dull surface afterwards. Thank you