Larry,
Glad to hear that your Aria is still kicking. It was a good model.
I have used West Systems G-Flex on ABS and on rotomolded Polyethylene (kayaks) with great results. It can even be pigmented if needed.
Used it to in 2007 to repair a 14" long crack in one of my kayaks and it has held very well.
Also used it to repair a cracked Walker Bay hull and it worked equally as well.
Hope you are enjoying your summer. Hot, hot, hot and muggy today.
Stephan