Did a bit different. Used the bubble wrap type two sided aluminum insulation. Made cardboard template on the outside edge of the plastic inside the coach sky light, cut insulation to fit. Used vinyl over the insulation wrapped over the back edge 1" or so, sewed the edge. Then used Velcro dots around the edge at about 4" spacing to hold it on. Matched interior of coach(looks good, not like a hill Billy fix) can be removed in seconds, stops almost all the light and the temp difference is amazing. Also used the aluminum backed vent pillows( I can't believe how much temp difference this made). What a difference in light and heat. We always seem to get the street light at our RV spot.
2004 Clss C 31' Winnebgo