Went back and made a new part for the windshield frame. This is just made up of 3 layer 3oz crowsfoot FG cloth.
The main difference was, instead of using Saran wrap (a big mistake), I used a combination of car wax and mold release. A few coats of both.
Nothing fancy with the wax or mold release. Same mold release I use for silicone molding.
I used a new canopy with the front still in place. I put multiple coats of wax and then 2-3 spray coats. The part released fairly easy - I bit of suction and you need to take care to not damage the vacuum molded part.
The inner surface is much smoother with the wax/release vs. saran wrap (on the left - no plans to use this part).