You might try something like the Markal brand of paint markers - La-Co
Industries.
Look in a good industrial hardware store, for sure a welding/steel shop.
This stuff is made to mark wet/oily/dry metal/iron/glass/ceramic/etc
"Gabagimpy" <spaceh...@yahoo.com> wrote in message
news:Qv%wa.15743$4_1.2...@twister.nyc.rr.com...
interesting question. I think a major consideration
might be shock resistance. it seems to me a
paint with superior adhesion that stands up to
heat or vibration might fit the bill. perhaps engine
paint. or an oil based primer if the numerals
are white.
I would use a small brush unless you want it to
look factory perfect. in that case I would mask it
before spraying.