I think you are right Brian. I've never experienced this before either. I always thought that the dope "locks" in the Koverall once shrunk. I really dislike iron on coverings as it bubbles and sags (for me at least). This is a first. I really can't see why heat from the sun loosens the tightness.

I can place my hand on the covering in the sun.... I mean it dosn't burn my hand and make me want to pull it away...Its hot mind you but not 400 degree hot. When I cut that hole in the cockpit floor, I did feel the heat that was trapped inside.

When she is brought in the shade, you can actually watch the sags go away in a few moments