i don't have any experience using rub ons. but i would think you would want to seal it with polyeurothane or some other similar sealant. i hope that that's something that's safe to use on foodware. just to be safe i would only spray on the outside of the cup. also, i'm not sure how well it would hold up to microwaving or handwashing. maybe google it to find out exactly how durable poly is. maybe you can find another sealant that way.
__________________ Rachel, mommy of Aiden
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