I am running out of the silicone gel to put on the O ring of my camera casing. Can I use vasline brought from drug store as substitution?

Thanks bros for the advices.  So where can I buy silicone gel for fuji casing?

I thought the silicone gel will help sealing the casing. If it is really not necessary, I will try next time without using it.  Thanks

Thanks bros for the advices.  So where can I buy silicone gel for fuji casing?                                                                                                                                                                                                                                                                                                                                                                               

I thought the silicone gel will help sealing the casing. If it is really not necessary, I will try next time without using it.  Thanks