I'm planning on doing a chimney install at my house tomorrow with my brother. It's suppose to be intermittent showers throughout the day here. Other than the obvious "the roof will be wet, be careful", is there a problem with installing a chimney in the rain? I'm concerned about making the seals on the pipe for the rain band thing above the flashing and also the flashing to the roof - is there a sealant that is fine to be applied in a moist environment?