That is a great idea and should work just fine. And if he is willing to do it for you even better! I have used weldon products on acrylic (thats is what its for lol) this will be very functional. If you just cant stand the thought of a cracked cup I would contact coralvue, customer service is top notch and they will take care of you.
Customer service phone number Ph: 985-781-9078 in case you need it.