Well, I went to ACE, you know, the place with the friendly hardware man!
After checking with someone who qualified as the oldest human in the world, the guy swore this two part epoxy putty would stick to ABS, and it was the thing to use. So, off I went, two part putty in hand.
I sanded the ABS as directed, kneaded the epoxy, and applied. IT DIDN'T STICK. So, rather quickly, I wiped off the dust from sanding and tried again, daubing marble sized lumps into the affected area. This stuff says it has a three minute work time. By the time I was finished sticking it in the groove, it was changing consistency. I could feather the edges. It looks pretty good.
It says to let it sit for eight hours. I'm going quail hunting for a couple of days, so will just let it really cure.
I think if I had it to do again, I would use some of that fast JBWeld. I had used it once before, and it is a little gooey, but sits up fast. Probably work it until it hardens enough to stick, then apply.
We'll see on Saturday.
Steve