I have learned so much from some very helpful people on this forum. Thanks, thanks, thanks!
I thought I would share a very easy and inexpensive sun/heat/cold block for my bathroom shower skylight. It may not be professional looking but the one that matters said it way great!
The first and second photos are of the installed completed project. As you can probably tell I removed 6 of the 10 screws that attach the inside finish cover plate to the shower ceiling. Using Tin snips I cut 6 approximately 3/4" X 1-1/2" pieces from a Tie plate (see photo 4). I did not have to drill any holes in the plates because the predrilled holes fit the removed screws perfectly. Using a utility knife I then cut a piece of R-Matte wallboard insulation (see photo 3) to fit inside the skylight opening.
Three of the six plates are screwed in snug and the other three plates can be swiveled to allow easy removal of the wallboard insulation. The wallboard can be inserted reflected side up or down.
It sure is dark in the bathroom now.
The material was purchased at a local Lowe's store. The Tie plate cost $1.05 and I had to purchase a full size 4' X 8' sheet of wallboard for $9.27. You may even have this material around. This was a lot less expensive than the shades I found in some of the RV catalogs plus the wallboard provides insulation.