Well it worked a treat. The swallow tail allows you to dodge trees like nothing else.
I did not mention the urethane I used before as it was untested but it stood up to temps of around -13c and did not crack or delaminate. This is what I used.
Selleys Urethane Bond - Adhesives | Selleys Australia
It takes 48 hours to cure and is very runny for about the first 4 hours, you need to mask up the top and bottom sheets of your board, let the tape overhang the edge by about 10mm and fill the gap, because it is very runny you can only do small sections at a time as it must be kept level to avoid it all running off the edge. I ended up doing about 3 layers and grinding it back once dried using a flap disc/angle grinder.
It is a bit of stuffing around but it did work flawlessly, there may be better methods, i am just telling how it worked for me.