I solved my own problem by practising on an old scrap fairing, but I thought i'd write it up as a reference for anyone needing to do a repair in the future.

I had a crack about 3-4cm's long on my LH fairing, I cleaned it up with a razor blade and some 800 wet and dry. I wiped the crack down with prep wash and let it stand for 10 minutes and blew it dry with an airline.
I used "selleys supa glue" along the sides of the crack and applied hand force to the crack for about 30 seconds then wiped off the excess.

This by itself is *fairly* strong but not like welding it, it will still come apart with enough force, so i reinforced the inside of the fairing with automotive bog (other countries call it bondo). Bogged and sanded the outside of the fairing as well. Just laid a coat of 2k over it, and you cannot tell a repair has been made, it is also now very strong and will not come apart with my hand force.

Hope this helps someone in the future........
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........."I love the smell of 2-stoke in the morning.......Smells like victory"............

MC21 Pentax SP...... TYGA'D