Use thin (like .6 oz.) glass, and thin CA first. Will smoke a lot, stay away from the fumes. This welds itself to the plastic. Then you can use 30 minute epoxy and thicker glass (4 oz. even 6 oz if the cowl is large), and the thin glass base gives the epoxy something to really grip. Best system I have seen yet, other than throwing away the plastic cowl and ordering a fiber glass cowl!

Another hint for wheel pants.......get the two halves so they fit fairly well, then glass the inside of them with 1-2 oz. cloth and thin CA, before you glue the halves together. Much easier to work in an open half. After gluing the two halves together, epoxy in several strips along the seam line. You can also epoxy in the plywood reinforcement at this time.

Hope these ideas make your modeling lives better!

Clair