Praise for 'Model X' adhesive here. While fixing the front fairing I found a small crack on one of the edges. The crack runs about an inch in length and penetrates through both sides, meaning that as you flex the fairing a gap opens up.
I put a drop or two of Model X on the edge of the gap and let capillary action draw it deep into the gap. After 5 minutes the two pieces were clearly stuck together. After 4 hours the repair was very strong.
https://flic.kr/p/2dhyUi2
I've used a combination of hot staples, PLA printed parts secured with both Model X and also a plastic epoxy, and an epoxy mesh in various places. The fairing is probably about 90% strong on the damaged side. The outer finish will sand and paint (or maybe vinyl wrap, and the inside will be unseen, but painted black anyway
Pics - - > https://flic.kr/s/aHsmyeLHfV
Hot staples are really good I have to say, easy, strong and not many downsides, except one I can think of.....they're going to rust eventually, while they're embedded in the plastic, so I will have to come up with an idea for sealing them, either by painting, or by packing the surface with a grease