I just noticed the other day on the 73 450sl, that the back left outer rubber cv boot has a rip in it. Some pro. tried to repair it with silicone. I would like to fix it better. Has anyone got a better idea for repairing this. I realize it is going to be replaced some day. But what is a good fix for now?

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Stable:
1973 450sl
1978 red diamond ice vette
1975 steel blue convertable vette
2002 steel blue dakota quad.