This is the epoxy I used. Very good stuff, also works on just about anything you would need epoxy for. I have repaired cracked panels with metal reinforcement with excellent results. The cowl is a difficult repair. These photos are an incomplete project. The cracks are epoxied, then sanded flat and reinforced with aluminum using the same epoxy.
Amazon, WalMart, auto parts or hardware store.
J-B Weld 50133 Plastic Bonder Structural Adhesive Syringe - Tan - 25 ml
https://www.jbweld.com/product/plastic-bonder-syringe