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Welcome to the Bunnings Workshop community @Gracesun It's a pleasure to have you join us, and many thanks for your question on rainwater tank repair.
Could you please show us a better picture of the hole, which would greatly assist our members in offering solutions?
You might like to try some T-Rex 48mm x 1.5m Strong Waterproofing Tape. It's designed to stop leaks from the exterior side.
Once we get a better idea of the damage you are trying to repair, I'd then be able to tag in some helpful community members to assist.
Mitchell
