the par-bond does come in gray and white, too. I wound up going to the only RV place in the area, and while they didn't carry it, they did order me a couple of tubes, so I'm just going to use that. I didn't get to the point of being ready to actually apply any new caulk over the weekend, anyway. Spent the whole time trying to remove the old stuff that was there...what a mess! some PO had just piled layers and layers of gunk around all the vents. Some of it was silicone, so 80% of it just peeled right off
Its the last 20% that is taking forever to clean up. I just hate the idea of "mickey-mousing" it. Those joints will need a good sized bead of vulkem, which I was able to find...but having read that it is hard to use on smaller seams, and I do have a few of those to do as well, I needed to find something appropriate for those, too.
I'm just wondering if the "alcoa" has a different name, as there are no references to it on the internet that I can find...other than AS support sites. I doubt they made something that was specifically for AS use, and named it "gutter seal".