STOPAQ AMCORR has a 2" or 4" wide tape product (EZ Wrap)that has been very successful in solving many roof leaks. It may be applied in temperatures that range 15 degrees F - 176 degrees F. It ahderes to virtually all substrates. That includes asphalt shingles, roofing felt, EPDM, PE, PVC, sheet metal, etc.
I have put this product on the edges of my flashings to completely seal them up. If you have any questions, just email me at firstname.lastname@example.org