I agree. Some have been successful bonding fiberglass to steel using a special epoxy but only as a full panel overlay, or where there are borders and seams. Also most autobody supply stores can get special mold release waxes and spray on mold release products that wont harm resins. In a pinch, I've used several buffed coats of Johnsons past floor wax, then cleaned the part with a wax & grease remover.
