I had a friend paint 3 of my cars in his garage and I wetsanded and buffed 2 of them ,then I found a guy that does it for a body shop and he charged $100 and a case of beer ,from now on I will hire that part out .As far as water in the lines ,a buddy came to my shop and told me to increase the size of the line coming from the compressor ,I think my outlet was 1/2" so he ran 3/4" plastic pipe yes plastic pipe from Lowes ,3 yrs and no water even in humid Indiana summers and I dont have a dryer on it