HI,
For bigger parts of your gear you could do laser etching on small metal plates like those you have on car and stick them on with 3m double sided tape
http://www.legendarycollectorcars.com/wp-content/uploads/2010/03/itsmine2-Small1-550x505.jpg
Something like that, and you can always remove it.
My first post on the forum hope it helps.