Sand the fiberglass with a 400 - 1000 grit sandpaper so you can not feel a difference between the fibergass filler and the body of the car. Now you can prime it.
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A measuring tape made of fiberglass. I have 3, very smooth and much better than steel tapes.
Rishon composite is a type of fiberglass.
it costs about £600
Aerogel is 39 times more insulating than the best fiberglass ever made.
The weight is (4) times (the weight of one cubic foot of the same material).