Can't find the link but one forum member had the best idea.
He cut a piece of solid colored plexi and the way he affixed it was IMHO ingenious. He took the existing screws out from the skylight frame and added those mirror clips to it, put the screws back in. So when he wanted to add the cover all he did was flip the mirror clips over it to hold it in place. Easy up and easy out and no holes drilled into anything.
Me, I haven't gotten around to doing it that way just yet so I just bought the 'removable' limo tint from Walmart.
Cut it to fit
Spray soapy water on it and the skylight and put up and squeegee out the bubbles.
Because I have an split bathroom open floor plan the sun coming thru that skylight was baking the MH in summer. Limo tint up and the temp in the MH dropped 20 degrees.