With all the recent heavy rain discovered a small leak in my spare bathroom.

I knew my roof needed a bit of work to clean up as the cold side covered in quite a bit of lichen, but was surprised when rain exposed 3 or 4 spots that have rusted pretty bad. Have lived in new place for 8 months and first time it has really rained!

Where the two sheets overlap, ridges have rusted through. Only one hole had rusted right through, hence the leak. Was where it was nailed, so the leak spread along about half a meter.

Longer term I will need to replace the sheets in bad condition. But plan is to chemical treat the roof to kill all moss / lichen (maybe a few treatments), fix rust / replace sheets and then paint.

Also suspect there is a very small leak on old aerial wire stay as quite loose (different location). Which will need to be remove and will leave a nail size hole.

Have done what any self respecting DIY hacker would do and filled everything with silicone as a short term fix to stop the water getting in!

My question is: What is the best method to fix holes in the roof?

My local bunnings store suggested Denso Tape. But I got confused on that as youtube etc suggested it was more suitable for pipe lagging. Someone else suggested a bitumen type paint on product.

Thanks