A bright Blue tarp laying on a tile roof has trouble keeping water from flowing under it. Wouldn’t it be better to remove the leaves, dirt and other type of debris from the area where the blockage is? (the sheet metal valley)

Once you move the stuff that is plugging the flow of water, out of the way, the leak will only occur when the accumulation returns.
Make a permanent repair by applying a patch to the area where the felt paper has failed and by completing the necessary correction so the problem can’t return. A 3-inch water-way down the length of the valley is key.

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