Heat set the glass: If you chose the kind of paint that needs baking to be set, you've reached that time. The process is very straightforward and no worries, your glass won't melt.
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Line a cookie sheet with aluminum foil.
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Turn your oven to 350ºF (180ºC). There is no preheating required. The idea is to put the glass in a cold oven -- this will gradually increase heat as opposed to placing the glassware in a hot oven, which might cause the glassware to break.
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Immediately put the glasses on the lined sheet and place in the oven.
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Set a timer for 30 minutes. Turn off the heat after 20 minutes, but leave the glass in for a further 10 minutes. Then, remove the glasses after the 30 minutes is up. Wait at least 24 hours to wash & use glass.
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Or..... do as as instructed by the manufacturer on the label of the paints you've used (this is done to make the item washable) Hand Wash Only- Air Dry for minimum of 3 weeks before use.
* NEVER PLACE PAINTED AREA'S ON or too near LIPS, OR MOUTH, EVEN THE NON-TOXIC PAINT IS NOT TO BE PUT NEAR MOUTH NOR INGESTED IN ANY FASHION. ALWAYS BE SURE TO KEEP A LARGE ENOUGH RIM FOR DRINKING AREA AT TOP OF ANY GLASS To be safe. NOT FOR CHILDREN'S USE.