Seam leaking from front cap movement. Need help

I have an '13 Passport. The front cap has all kinds of waves in it near the top as it rounds up to the roof. There is a metal hold down bracket that spans the seam. I have put Dicor on it twice already this season. Just came back from a camping trip which we had a little bit of rain. Went to get some clothes out of the cabinets above the bed and they are all wet. The seam was leaking again. Went up to inspect on the ladder and found a gap of up to 1/8 in the Dicor. Apparently the front panel is flexing with the heat and deforming which pulls the seam apart. I know this will be an expensive repair but I am looking for a short term fix to get me through the rest of the camping season as we cannot be without the camper for more than a week with our remaining schedule. More Dicor is not the answer.I am thinking eastabond tape with some sort of metal or plastic piece on top then Dicor to seal the ends.