Anyone looking for a great epoxy should try Norton Structural Adhesive Speed grip. Great stuff for replacing door panel inserts that need to be drilled out to be recovered. It beat buying JB Weld. For some plastics you will need to buy a can of adhesive promoter but it does make sticking to > pp < capable. It also comes in different work time.
Ditto I use the same stuff myself. I normally just mix by hand for small projects. I do use the mixing tips for big projects. The tips are too expensive to use all the time. I also use various 3m and scotchweld adhesives. I generally go for the urethane adhesives. I'll put together a list of the ones I use if anyone is interested. It can be a bit overwhelming researching all the different options.
I like to use lord fusor products. They have a wide selection of products, large and small sizes and 12 to 18 month self life after opening. The one i use for abs is super strong and sands like bondo i believe its the 152.
For gluing ABS to ABS I have found the plumbing stuff from the hardware store works awesome. Just use acetone as a primer. I build 95% of my panels out of ABS and so far this glue has been the best I've found for ABS to ABS!
I have found it is helpful to use a plastic prep solvent, and to also scruff up areas of contact with 180.. Gives the glues and epoxies something to grab.
I know that tips can be expensive esp when you go through the ones that comes with the 2 part epoxies. Wurth sells separate tips in bulk for much cheaper than 3m or lord fusor or the like. I have found that 3m 4240 works well but has a very short work time of a few minutes but is nice as you don’t have to wait more that 10 min to start working with it again.