Here you go:
https://www.ninjette.org/forums/showthread.php?t=42690
Yes, the OEM fairings are ABS plastic, so you want
ABS plastic cement. This is nasty stuff (don't get it on your skin or on the good part of the fairing) that melts the plastic and actually does weld it together. Once the solvents evaporate what's left is ABS exactly like the the fairing. Solid plastic.
I don't know where you'd find it in Mexico. We have large hardware/home repair stores here in the US. I got this at Home Depot.
This works for cracks and is thick enough to fix very small holes, but won't fill big ones. It is not suitable for scratches. It is ONLY to weld plastic together.
The tighter-fitting the crack, the better the repair will look. The crack I fixed was very clean and tight, so it came out almost invisible. On a rougher or larger crack, the repair will show.
The "two tubes" stuff you've found is epoxy. That will work too but ABS cement is better for fixing clean cracks.