a few quick questions

1. What is the size of hose for heater core to engine block?

2. How do you install carpet? do you use adhesive? if so how much and what kind? Reason why i'm asking is my car's previous owner put the carpet in but when he did so he put a whole mess of adhesive on it, probably not spray, and when i was pulling it out it ruined the carpet. I had to get new color carpet anyway cause it was wrong color and stuff.

3. Do you put clear coats over engine paint? I painted air cleaner and wondering if I can put a clear coat over it, if so did it come glossy, flat?