How do you do your gaps and alignment?

[jr421]

Ok I have a question about this thread and its been bugging me for a hole day so I have to ask or I might go crazy. I understand the concept of using filler to improve door gaps and panel fit up and I know its become an industry standard, but is this a good process for a car thats in the midwest? I have talked to several autobody guys that say thats a great process if your car is stored in a heated garage or in s more stable climate and doesn't see exterme weather changes. I guess my question really relates to the thermal expansion of the filler vs. the steel body part and cracking after a few years. I guess when I start looking for a local painter for my camaro I want to know what I am talking about, any input is greatly appreciated.