My R1150-RS had a minor tip over, but it broke the upper fairing and also cracked one of the tabs that the left, front turn signal screws into. 🙁
I used Plast-aid to attach the wiring bulk head connector in a Windjammer II fairing with great success. Vetter used ABS plastic in the Windjammer fairings. I believe BMW is using ABS or a similar plastic for the body work, so Plast-aid will work well with it. It worked so well on the R1150-RS repair that a few months later, I used it to repair a number of cracks in BMW touring cases (aka, Krauser panniers).
Repairing Broken Screw Tab
I use a washer to help reinforce the srcew tab. Plast-aid will mechanically bond to steel, particularly if it has been roughed up with 100 grit wet/dry paper.
I mix up a small amount of Plast-aid. It changes consistency as the chemical reaction progresses. I wait a minute or two until it is the consistency of pancake batter. While I wait, I put some of the liquid component on the edge of the tab and the remaining edge on the fairing to promote good adhesion. When the Plast-aid has stiffened a bit, I put some on the edge of the broken tab. I hold it against the remaining tab surface of the fairing until it stays put, about 2 more minutes. I use the rest of the Plast-aid, smear some on the washer and the apply it to the back side of the tab for reinforcement. I hold this in place for another couple of minutes and I’m done.
Repairing Cracked Fairing
The fairing crack repair needs reinforcement. I use a small piece of fiber glass mat and shape it to fit behind the crack. There is a small brace above the crack that reinforces the other screw hole for the turn signal and I anchor the fiber glass against it and down across the crack.
I mix up a larger amount of Plast-aid and apply some of the liquid component along the edge of the crack to improve adhesion . I put some on the edge of the crack, aline the edges so they are tight and put some masking tape over the crack to hold the pieces together.
I put the fiber glass into the Plast-aid when it is the consistency of Elmer’s Glue to soak some into the openings of the fiber glass. I put it on the back side of the fairing, and add some more Plast-aid using a Popsicle stick. I have to hold the patch in place for a minute or so using a finger and the Popsicle stick. When it becomes very firm and the fiber glass stays put, I’m all done.
Here is the final repair. It will need to be sanded, some bondo used to fill in the scratches and painted. But that’s a job for another day when I setup my temporary paint booth again.