I used to work on a aluminum dive boat . The owners were always on us to pick up change on the deck . There was something about a oxidizing reaction between the the two metals I cant rember for the life of me what this is called.
stonedar maybe those are vinyl? i actually just wound up going with the corrugated roofing, the gutters were just a little too small to fit the gallon bags into. thanks everyone for the input!
