View How To Seal Painted Ceramic Pots Pics. If you are a visual learner here is a tutorial on painting an already painted and glazed flower pot. Sealing ceramic vessels isn't very hard as long as you have the right equipment.
Grab the pringles cans again, set them up outside (somewhere with good ventilation) and give the entire exterior of the pots a good solid coat of clear acrylic sealer (including the bottom of the pot.
The best way is to use ceramic glazes (overglaze not underglaze) and refire the mug. Generally speaking, potters use underglazes, slips, engobes, and stains to paint on their work. How to seal painted pots and why it's so important. So, paint your ceramics product yourself and make your regular.