I took a rare 1930s copper fog horn to a media blasting company for
removal of the light copper oxide some old paint patches prior to
polishing. I asked for very light soda and/or fine bead blasting, but
they screwed up and blasted it all over with black silicon carbide,
completely pitting the crap out of my rare collectible! It feels like
220 grit sandpaper now. I ultimately want to buff the horn to a mirror
finish as I have done with similar models in the past, but I'm now a lot
farther from this goal than before the blasting incident, and I'm not
sure where to start repairs. Because I'm seeking damages from the
blasting company, I also need to come up with a plan so that I can give
an estimate for the cost of repair. There are only 3 of these horns
known to exist, so replacement is not an option, nor is there any known
value for the item. Restoration is really the only option apart from
fabrication of a replica from scratch.
I'm wondering what my best option is for resurfacing the horn to a state
where it can once again be ready for buffing. Would bead blasting hammer
the copper to a smooth finish again, or is my best bet to use scotch
brite wheels to sand out the roughness? It's too deeply pitted to get
anywhere with hand sanding or hand pads. The rolled copper sheet is
fairly thick, perhaps 3/32" or so, but I'd still like to remove as
little material as I can get away with so that integrity is preserved.
Any related advice is also welcome!
Thanks,
Adam
adam AT airraidsirens D0T com
- posted
18 years ago