hair line cracks in my trailer plastic molded body

[Brake Pad]

what's the best for repairing plastic molded trailer. the area where my coole sits, has a 4" hairline crack.

[djh3]

Mike you sure its plastic? ABS like the fairing stuff I would have to guess right? Some have had decent success with the plastic welder thing from Harbor Freight. Our fiberglass stuff on the race cars we use to stop drill the very end of the hole, same on aluminum on the aircraft. When I worked for U-Haul we stop drilled the end and put a pop rivet in it to displace the stress.