[jaclaz]

Yes, fiberglass won't stick well to polypropilene.

It is however possible to do this kind of repair with fiberglass if you drill a few holes just over and under the crack.

The resin will get into the holes and keep the inner and outer fiberglass layers together, besides acting as a sort of nails transmitting the forces applied to the basket to the outer fiberglass layers.

But unless you are familiar with fiberglass and have the materials from another project, it makes little sense, you can have the same result (with the same technique of drilling a few holes) using metal epoxy putty, the kind that you cut a piece from a stick and knead/mix in your hands.