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How are basses aged??

Lots of buffing to wear down the finish, and in Fender's case, baking the plastic bits in an oven with UV rays to accelerate aging.
 
Some of it is low tech, just like you'd think...other parts take a lot of work...I have an instrument that is done very well, and there other tricks used...build up of clearcoat with the proper yellowing, but only in certain areas...

Weather checking is done by 'freezing' the finish with compressed gas (there are a few ways to do this)


I've done hardware before, and used several different acids for the wear.