Any suggestions for sealing acrylic paint on glass?

I am making little votive holders for my boyfriend and a few mutal friends that have their fraternity letters on the, Im using acrylic paint on glass. Any suggestions on tip on how to seal the acrylic paint from chipping off the glass or to keep it from coming off when its being washed. The votive holders can... show more I am making little votive holders for my boyfriend and a few mutal friends that have their fraternity letters on the, Im using acrylic paint on glass. Any suggestions on tip on how to seal the acrylic paint from chipping off the glass or to keep it from coming off when its being washed. The votive holders can double over as a shot glass. Thanks in advance.
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