Insulation will be 1 1/2" high density foam. And I do have a question. I want to just rattle can the foam insulation black but I don't know if it will take the paint and not be harmed/corroded by the paint.
I think I would put cardboard on walls and ceiling and paint it black. O try the paint you are going to use on a small piece of the insulation and see how it dose. Then to be safe don't mix the types or brands of paint. Looks good so far should work great when blacked out.