Good information--thank you all. I'm almost done with a 45'x54' shop. The concrete guy didn't want put down plastic and I probably couldn't have afforded it--if I insisted. I'm pretty happy with the outcome but am noticing some chipping (possibly de-laminating) on the surface in the large...
Kevin,
Glad to see someone from Montana on GJ. I just joined GJ myself to help with determining the size and layout of a garage/shop I will be building in the Kalispell area in couple of years. Will be out there next week. Jeff