I've used Paraloid (Acryloid in the US) B-72 as a base coat for marking objects,
with black or white ink for the numbering, depending on the colour of the object - a method
which seems to work well. I got a solution of 50% and then diluted
 it using acetone to get a suitable consistancy to apply to the object.
 B-72 is used in conservation treatments and has been tested for its
suitability for use with museum objects - it remains soluble in acetone
and doesn't yellow or peel. The ink used should be pigment rather
than dye based as it is less likely to fade or lose its colour.

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