.... use a soldering iron and staples ....
I like the idea of reinforcing with metal. My 400F side covers both have rather weak attachment slots. I melted in a 2 inch length of stiff (suspended ceiling) wire to make that part stronger.
I'm a little inhibited by the fiberglass process (goodness knows why). I expect it's probably a pretty good way to go, however.
I like JB Weld too, and I first used it to cover the wire I inserted into the attachment slots.
But now I use this stuff for most of my repairs.
http://www.tapplastics.com/shop/product.php?pid=108It's called "MarineFIX" and I think it's made by the same people who make all those "goop" products. JB Weld is kinda hard, and hard to finish. It's also not cheap - depending on the amount you need, of course. I like the marine fix stuff because it seems to cure to about the same density as the plastic parts on my motorbike. (At least on the two parts where I seem to need it most - the side covers and the headlight bucket.) It's cheaper (by volume) than JB Weld.
When I first used it I wasn't too ahppy with the result though. That was becasue I used it like a filler, and just cleaned up the "wound" with sandpaper, and used it like poly filla. It was okay, but not as good as I thought it should be. So I started fixing cracks by actually cutting the wounds bigger a bit. So a normal crack, in which the pklastic still butted up together - I cut out about a mm or so along the length of it, and then filled in the hole with the epoxy. It works really well, and I think those areas where I did that are now stronger than they were before the damage.
I also like it because, like I said, it's roughly the same as the plastic - maybe a little more dense, buit not much. It's almost the same colour too, which helps (albeit minimally) with the painting process. It dries very quickly, whcih is nice, and it's reasonably priced.
How ever you tackle your repair, good luck to you......
Cheers
