Nullifier said:I hope you drilled out the ends of those cracks. If not look for those to continue along the current route effective immediately. Always drill a small hole at the end of a crack to stop it from growing.
On those type of vacume formed plastics the best thing to use is Devcon Plastic welder. THere are various types some sandable and paintable some not. They fully cure in 20 minutes and will hold on unbelivably well. The plasitc welding adhesives allow for the material to flex and not create a weak spot. These methacrylate adhesives come in small tubes like 5 min epoxy. You mix it up and then apply. They run ususally between $15 and $25 per tube but work really well.
http://devcon.com/devconfamilyproduct.cfm?familyid=330&catid=26