[old dog]

What kind of paint can be used on a helmet without weakening it?

 

[superdave]

What kind of paint can be used on a helmet without weakening it?

Just don't drop it while you paint it, and you will be fine

 

[qwerty]

Depends on the material of which the helmet is made. Some paints dissolve some plastics. Disassemble the helmet and put a dab of paint in an out-of-sight location and see what happens.