Both methods should work;polyurethane varnishseems to be a fairly standard way of sealing acrylic paint on ceramic (see this thread on potters.org for example) and Art Resin*claims that ‘the heat generated from a hot mug will not damage the resin surface’ and that it is suitable for use on ceramics (ArtResin FAQ, points 24 and 25).
People also ask
How do you seal a porcelain tile?
For ceramic and porcelain tiles, choose a solvent-based sealant, and for natural stone tiles, choose a water-based sealant. It is necessary to clean the tiles before applying the sealant. After the plate dries, spray the seal on the surface of the plate, then let it soften for 5 minutes.
How do you paint a ceramic tile countertop?
Apply a thin, even coat of spray-on primer that is formulated specifically to adhere to surfaces such as ceramic tile. Let the primer dry completely according to the directions on the label. Spray or paint on a thin, even coat of oil- or water-based acrylic paint. Let the first coat dry completely before applying a second coat.
Does acrylic paint work on ceramic tile?
That said, as long as the surface is prepped correctly and primed and the tile is not placed in high-traffic areas, acrylic paint works just fine on ceramic tile.
Can you paint over ceramic tiles that can’t be fired?
Firing is not possible if the tiles are already affixed to the wall or to a tabletop. The key to painting ceramic tiles that can’t be fired is to start with a durable primer that’s compatible with both ceramic surfaces and acrylic paints.