[QUOTE=boywonder;185884]I made a sandwich of headliner material-reflectix-headliner material...about 1/2" thick total. Black on both sides, although that's mostly because that material was on the bargain rack at the auto fabric store.
Stays in the window openings pretty well, and provides quite a bit of insulation. The long term plan has been to sew a binding around the perimeter, but haven't got that far yet.
I used hi-temp spray contact adhesive (headliner adhesive) to glue the three layers together.
QUOTE]
I did nearly the same thing. I did black headliner>reflectix>tan automotive carpet stuck together with high temp contact adhesive. I sewed folded black nylon webbing around the edges to bind them.
My thoughts were that I could put the black out for privacy and when it is cold out, keeping the lighter tan inside so it wouldn't feel so dark when the lights are on. If it is hot out the tan could go out for less heat absorption. I probably would use a tan headliner instead of the carpet if I were to do it again. I think my original plan was to leave the refelctix exposed on one side, but I had the carpet laying around so it got included.
Not seeing the foil from the reflectix on either side made it feel better inside and blacks it out well from the outside. We only have the front three windows. This is not the not the best picture, but here they are stowed away.