Clark,

A better test for materials would be a magnifying glass.  The tilt up canopy’s act just like one when the sun is behind them at the wrong angle. 

You might try Flat Black VHT rattle can paint (for auto headers) on a scrap of fiberglass.  If that works, you could test plot the area that gets the hot spots (in a Legacy it is the forward half of the dust cover).   Then stop the fabric before it gets to the hot spot area. 

We are using Ultrasuede and don’t have a burn spot yet but it is fading to dark grey even though we are very careful to cover it anytime we are not flying. 

A fabric that might work is thin Microfleece.  Black is non-glare and it is stretchy and cheap enough to replace easily.  Test it for flammability!

Steve Colwell