[quote name='BurritoBass' post='691001' date='Dec 21 2009, 09:07 PM']my oldest P-bass had rust on the original pickup after literally hundreds of gigs.[/quote]
Sorry, this isn't clear and I didn't want to edit as I've been quoted already. The rust on the pickup was from gigging pre-the ashtray covers. My point here is that at a hot sweaty gig I'd much rather sweat on a cheap bit of replaceable plastic as opposed to the pickup. Sorry, this post was bugging me!
I never used to clean down basses after playing and my general approach / attitude in my early days was very different to what it is now. I'm not suggesting that ashtray covers need protect a pickup, mine are just there because I like them. This was just a problem from my early playing days.