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in short. yes he is right. think of it this way. OEM is probably the best thing you can buy for your car, brand-wise, so why buy a material that is of lesser quality?
Fiberglass can shatter like glass in even the smallest of impacts. Urethane>fiberglass
Even if it doesn't shatter it could cause the paint to crack horribly, Especially with Cobra R front bumper that already has clearance issues. And to really stress it, I've heard alot of body shops charging extra to paint fiberglass parts because they need more prep work.