For ABS crack repair I used Oatey brand ABS cement and some fiberglass cloth.
Man, it worked great.
It's definitely for areas out of view. but if it's not in a spot you'd see, it works great, dries quick and paintable.
If you really want to strengthen a crack, cut a piece of ABS from a junk part and use it as a backer WITH the fiberglass...
I did this with my dashboard in my '91. The areas by the speaker and the mounts in the dash/defrost duct... was really happy with the result.
From my experience... Superglue and two-part epoxy does
not adhere to ABS.
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