@greg5 Actually, you do have a planer albeit, one with a very narrow blade, your Shapeoko! Smoothing the top or last layer pour works great and your don’t end up with plastic dust from sanding everywhere, just chips 
For my final finish, I’ve had great success spraying with a polycoat type finish, satin, gloss or somewhere between after sanding with 220 when finished smoothing.
This thread dives deep into the options and finishing techniques by several users including @AndyC and @fenrus , and others, as @Julien had mentioned. Looking forward to seeing your final result!
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