Staples. And some aluminum tape to seal the edges.Good work, Tally Ho. How did you attach the Reflectix, staples? glue?
BTW, I use the same material on the inside of the companionway plexiglass to reduce the greenhouse effect from our Arizona sun.
I also have a piece cut to fit in the top of my top load reefer. Helps keep the cold in and not hard to move out of the way to load more beer.
Greg