How TOO..fix cracked plastic fairings, spray paint bike properly?

The heat gun idea isn't going to work. I've tried with other plastic objects before. At the very least, if it works, it won't be pretty. You're going to want to use adhesives. You might put some sort of reinforcing patch on the back. If you have to, use body filler to smooth out the cracks.

you can use patching compound to cover the crack. you mas first sand off the piant. than apply the patching compound then set it or dry it. when dry! fine sand it to finish it. it will be like new when you painted it.

A lot of bike dealers have plastic welders. I've had it done on Vetter fairings although this isn't something that's always pretty. In a concealed it's ok though. Here's what has worked for me with busted or cracked fairings. Behind the crack, I lay a piece of 3/32"-1/16" sheet steel like that commonly found on kitchen appliance doors, small signs, etc. From the side that shows, I bore holes through the plastic and metal and use small pop rivets to secure the two together. When painted, the rivet heads don't really show up that bad. I've never had the need, but I guess if the plastic was thick enough, you might be able to countersink the rivet hole just a bit and then use body filler over the head. If you do this, one thing you might want to do is to stagger the rivets. For example, it you lay a 3" wide strip behind a crack, don't make two nice even rows of rivets 2.5 inches apart with rivets 1" apart in the row. Instead, place rivets 2" apart in the row with two more rows closer to the crack itself with rivets 2" apart. In other words, try to place the rivets in a W pattern. This kind of repair is very strong and I've used it to repair heavy, heavily loaded parts such as touring fairings with great success. I like it better than plastic welding because while I've had plastic welds crack again, I've never had a riveted repair fail again.