Winnebago Class C Spirit

Had a leak in the overhead cone front bunk and removed anything related to the leak.  I would appreciate it if anyone has found where I can purchase some flexible fiberglass to replace the one I ripped out.  I thought about using fiberglass used for cove lighting but I don't want white.  4x8 piece would do nicely.  RV place wants $350 for a piece.  Blue Compass also charged me $65 to check pressure in my tires when I brought in for NC inspection.  1st and last time going there and I thought Camping World had issues...lol  Any info on this question would be very appreciated.  As in my profile..I'm turning 72 and would like to finish it so hubby and I can use our 2018 Spirit before I die!!! Only 6k miles on it since bought new....and I don't let him drive it cause he's a terrible driver who thinks stopping right at a red light saves your brakes!  I also tow a 2008 jeep wrangler.