Restoring 1970's fibreglass bodied (and chassis) car.
sanding down to gel coat, there are star cracks in the gel coat. I believe using a flexible epoxy might be a  suitable way to repair the cracks after gently opening then out with a rounded burr (rather than sanding whole area to mat and re mat/glassing?
Could you advise please and also recommend a powder filler to include in the resin?

Any advice gratefully received.
Thanks,
Neil Jones