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Mark _australia said..
so every amateur sugar deck I see is yellow and horrid.
To each his own... My only try of a commonly available spray grip once monster paint was banned in EU has been yellowing and horrid.
Applying a thin epoxy layer is super simple: Just wet your gloved fingers with it and brush the deck, pulling on it to the max. Less prep than with a spray bomb. I just ordered my UV-resistant epoxy online. This can also replace anti-UV varnishes over paint or a ding repair.
But I agree you must be smart enough to search for how much sugar to apply and/or practice beforehand. I am constantly astonished when people use glues or resins without reading the instructions...
Another technique used by Windsurfing board builders was tear-off cloth, but it is more involved.