Technique may be the culprit!
I sanded the surface with a 3m foam sanding block to take away the shine. Perhaps that is too aggressive compared to Scotch-Brite? I didn't scuff the v-cut interior surfaces, so that seems like a failure on my part...
I waited about 3-4 min. after spraying before attempting to bond the surfaces.
Geeze, I just wanted to blame my tools!