Best method for repairing fiberglass

I need the experts help with this one. I just got back my fully painted (and quite stunning I might add) Boba Maker jet pack that I commissioned another TDH member to paint. It did not survive transit and has arrived with a few cracked and broken pieces. What is the best method for making repairs to fiberglass without further damaging paint, etc.?
I can post a pic if it would help but one of the rocket cylinders is cracked almost all the way around and the bottom vents are broken out. It's very unstable. I'm bummed, but where there's a will...

Please help guys, I'm too far along at this point to give up. I'm only a pair of boots away from finally finishing my costume.

* One thought...Is it possible for someone here to make the vent piece on the bottom of the pack a seperate piece that can be glued into place?

Any help would be appreciated.

Just about any material works well on fiberglass. Goop, super glue, bondo, epoxy putty. I use all of those, depending on the exact nature of the problem.

Often I'll do epoxy putty on the inside and bondo on the outside. Or goop on the in and bondo on the out.

Post up some pix of the exact damage and it will be easier to brainstorm about it.

By your description it sounds like something that any 5 minute clear epoxy should fix....non-critical areas in either of sight or strength. A pic would make it easier to advise, but sounds like a straight forward enough fix.

Fibreglass repair kit?

Pics would help. If it were mine and I could reach inside to the broken part, I would use CA glue and then mix up some fiberglass resin and reinforce the cracked area. You could also use a little fiberglass matt on the inside for strength.