thomas.heinz

I think there is no real answer to this question.It just depends on your helmet's condition so you gotta chek it. Check the outer shell, impact-absorbing liner, comfort padding and retention mechanism.Here is an article http://bestadviser.net/reviews/features/properly-chosen-helmet-halfway-to-a-safe-ride/ that might come in handy.Hope it helps you!

Never heard about something like that but if i was in your shoes I would refrain from that idea.