Limits?? No.

Spinners are used for a number of reasons Appearance, Streamlining, Safety and Balance.

Appearance; they look nice and you can colour coorinate them with your plane.
Streamlining; something of a debate, when in doubt refer to Appearance.
Safety; another debate, better to be hit by a smooth nosecone than a rough propnut, but the propeller is right there to cut into you so damage will be done regardless.
Balance; If the AC is tail heavy a heavy spinner/propnut can make the differance in balancing the Plane, conversly a light spinner can reduce the weight in the nose.

Buy a spinner that fits the AC, engine and prop, plastic works just fine.

If you develop a crack, loose a chip discard the spinner immediately. They can explode and send shards flying, as well as damage the engine.