I think there was a topic about this !?
The rubber that covers the spring will stop the spring chipping but will start to look a bit rough with use.
Cover it with tape will renew the look but you may find that if you try to remove the tape it hard !?
I use Cling Film Wrap to cover spring frist. You can buy the cheap stuff and use lots !
Just unbolt the spring near the hoof to make it easier to pull film tight. You will notice the film doesn't fit tight on the insideof the spring but that doesn't matter then .... any tape will do as it will never be touching the springs.