Lesson learned about sanding

I've learned a lesson this winter about sanding epoxy:  it takes 5 times more effort to get a smooth finish once the epoxy has cured for 6 months.  I feel like I'm going through a piece of 80 grit every 1-2 feet!  The other lesson here might be to make sure your epoxy coats are really, really smooth and drip-free when you build it up over the glass.  

 Just wanted to share... 

Truer words were never spoken.