I don't think I've ever had tint done in the winter, but on my last three vehicles, there were no bubbles whatsoever and there was no curing time. They looked great from the time I picked them up. They generally use heat guns and space heaters and whatnot in the shop to help speed up the drying process - it sounds to me like they stopped a little early to save time. I don't know whether this problem will correct itself over time, but in cold damp weather, I have my doubts.