You can test it like you test for leaks in tires... get a little soapy water and look for the bubbles. I usually don't recommend repairing them, but I have repaired one of the plastic ones using some leftover fiberglass from a previous project. I rough sanded the area around the crack (1.5 inches around it), and created a patch out of the fiberglass. A little high temp paint on it and it looked great. It lasted at least 2 years and was working fine when I eventually sold the car.
I was lucky enough not to have a crack on a seam though. If a seam is separeted or cracked, Id throw in the towel.
Good Luck!
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Originally Posted by Majestic
