Dave- It is aluminum. I thought about TIG welding it at very low amps. I decided against it because it would make removal very difficult. I will try JB weld next.
First, I will see how long the blobs of Dicor last. I lightly scuffed the inside of the drip rail with an angle grinder so that the Dicor will have something to grip on to. I spread the blobs about 4" long, about 1/8" thick and contoured to the inside of the drip rail.