I recommend spray painting on a cloudy day or in the shade.
How to paint over a glazed ceramic pot.
How to repaint glazed ceramic planters.
To prep the surface for spray paint on a glazed or a ceramic item first go over the entire surface of the item with 100 grit sandpaper.
Empty and clean the planter.
This creates a textured surface that paint can easily.
Adding painted details to glazed ceramic pots clean the glazed surface with a glass and tile surface cleaner applied to a damp sponge.
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Do not spray paint the pots if they are in direct blazing sun and are heating up.
Remove any plants from the planter and set them in a plastic container or another glazed ceramic planter.
Apply enough pressure to remove some of the sheen but not too hard that you make deep scratch marks.
Wipe with mineral spirits.
Paint the clean dry pot with craft paints designed for use on ceramic or porcelain.
Place the painted pot in a dry place and wait for the paint to air dry.
Set out a drop cloth to paint on.
Paint the ceramic piece with primer.
Paint the entire.
Sand the entire ceramic piece with 150 grit sandpaper.
Touch up old paint.
Let the pot dry for 24 hours.
Rough up the surface.
These paints will bond with the smooth glazed surface of the pot while other paints will rub off or begin to chip soon after painting.
How to repaint already glazed ceramics step 1.