Fiberglass Body Repair

I have had this fiberglass body for about 20 years.It has some minor cracks here and there. This is the worst. Any ideas if this can be reapired.

 

A bit more context as to the locations of these photos? I have a 'glass tub and fenders too. I have one area on a front fender where the inner wheelwell is separating from the outer skin, that looks like one of your photos.
My way of repairing very dirty areas is to very lightly sandblast everythig clean, then my go-to "glue" is WEST System epoxy thickened to a paste with Cabosil/Cavasil.
-Donny

 

Glass is fixable. grind the edges to a thin taper and layer glass and resin back into the crack till it’s at the right height grind and fill for finish from there.

 

Better photos. I just spent a year or two restoring a fiberglass tub but I'm not sure what I'm looking it. The third photo looks like it may be a joint where the resin didn't penetrate very well but it's hard to tell.