Can your Car Magnets stick to car doors that are fiberglass ?

No. These are magnetic signs, so they only hold on metal. They will not stick to fiberglass, aluminum, or other non-magnetic body panels.

• They adhere to magnet-receptive steel surfaces only.
• Fiberglass, aluminum, and plastic panels will not hold a magnet.
• To check your vehicle, hold any ordinary household magnet against the door. If it grips, a car magnet will hold too.

If your panels are non-magnetic, a printed vinyl decal is a better fit than a magnet.