So true Brian...I've had customers ask me how long do I wait before I cut and polish a car...I tell them that I usually wait a couple of days for the clear to cure (depending on the amount of clear, was it baked, temperature etc.)....Then I get asked about leaving it for longer in case of sinking or or sand scratches...I tell them that they needn't worry, I finished my body work in 320 grit. I know with 180 your not going to have a problem with sinking....it's just that insurance policy I take out for myself and on a fender it may take an extra 15 minutes of blocking. That's time well spent when your doing custom or restoration work...that extra time, maybe not so much when your doing insurance work. It's all relevant, I want to give my customers the best I possibly can...If your finishing in 180 for Insurance Company's, in most cases your probably giving them more than their paying for.