If it had sides on it would be twice as effective, or there abouts.
If you bought fiberglass roving & matting + a liter or 2 of fiberglass resin you could make a improved version of it.
I would use a one sided waxed mold identical to the car, to shape on to help keep it accurate.
Could cost $75 bucks for material & some touch up ,color match paint.
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Ride a Mtn bike for errands exercise entertainment and outright fun
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