Leak where verandah roof joins the house

My house and verandah have separate corrugated iron roofs. The verandah was added later, and the sheets extend a short distance below the sheets of the roof. The overlap between these two levels is not sealed. The house roof is quite a steep pitch, while the verandah roof is reasonably flat. In the north queensland wet season, water travels up the verandah roof and leaks under the house roof iron onto the verandah below. We have a lot of trees overhanding our roof, and because of the flat pitch of the verandah roof, they sometimes come to rest just below the join, allowing water to bank up there and making the problem worse.

I would like to seal the join between these two layers and stop this happening, but the fix is made more complicated by the fact that the curves of the corrugated iron on the house and verandah levels are not perfectly aligned, so the shape of the space between the two roofs varies, making the weatherproof foam and rubber inserts that are usually suitable for this purpose, unsuitable.

I have considered using some kind of weatherproof tape but due to the misaligned corrugations, I am not sure that I would be able to make the tape curve as necessary and make a good seal. I have also considered some kind of waterproofing membrane treatment but I don't know much about them. Does anyone have any suggestions?

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