Reduce Skylight Heating 

Interesting approach. But that has to be the most ineffective taping job I have every seen. Using tiny little pieces of scotch tape is not going to work for very long. You need to use a stronger tape, perhaps aluminum tape, all along the overlapped edges of your mylar that will hold more effectively and for much longer. Keep in mind that the great deal of heat up there is going to soften the glue on most any tape, so maybe even use some kind of aggressive adhesive instead? Also I wonder if adding the barrier, whatever it's made of, outside the skylight instead of inside would be even more effective? Our single skylight is right over a staircase which makes me interested in this approach. Generally outer barriers reflect away more sunlight than inner barriers, at least I think that's the way it works. For example, if you put an umbrella on the roof over that skylight, wouldn't that stop much of the heat better than an inside barrier? I'd experiment a bit, not with umbrellas but with whatever could cover the skylight temporarily. Alternatives: Closed cell foam pads are designed to NOT allow the transfer of heat away from your body when you sleep on them. Would one large pad covered in reflective mylar work even better? If you could somehow drape 12" of fiberglass insulation over the outside (or inside) of that skylight as you do in your attic to keep heat inside the house in winter and outside in summer, that would also cut the heat down dramatically. Is there such a thing as "venetian blinds" for skylights where you close them only when you need to? How about using window reflective film on either the inside or the outside of the skylight to reflect away the sun? Getting it on would not be easy, but it could be done from the outside in the same way it's added to car windows -- squeegee, water and soap, etc.

Great video! Any issue with melting the skylight from this?