i would recommend the autosmart .new image polish .its a cream. wipe on wipe off . can be used on just about any surface. we used to build grp bodies for trikes plus fitgrp high tops . founf it really good. i have used a trafalgar chemicals universal. not quite the same but similar.i say ask a good friendly car sales place they can tell you who they use. i,ve used autosmart for best part of 30yrs . used on concourse ,custom and vintage show cars vans etc. remember in a garage we had lots of cars to clean .want easy quick long lasting finish. the days of turtle wax as gone.
the trike bodies all had coloured gel coat and could be made to look like glass. also windscreens on bike fairings .remove scratches with a bit of effort.