I used standard 1" styrofoam on my ice tank and then coated it with silicon so the possible spill from filling my gas tank wouldn't eat at it. It's been on there for 5 years and working well. I didn't insulate the actual aw intercooler as it is mounted inside the car. It still sweats (Intercooler) but doesn't cause any problems. I should insulate it as I did my tank, just to stop the sweating.