Folk Art makes an Enamel paint for use on glass..I use it to do one stroke painting on glass..the directions are on the bottle, but basicly after you paint them you put them in the oven for 30 min., let cool over night and they are top rack dishwasher safe..or let the item dry for 21 days and that works same as baking..coverage is good and perhaps you could leave the canisters the color they are now and paint something on them in the colors your now using...take a look at nature..green surrounds all colors and looks good :0)
gardenlady

Kittymommy-Delta also makes a paint for glass and ceramic tile that you don't have to bake.It is called CeramDecor.I got it at Hobby Lobby.You apply a surface conditioner then 2 or more coats of the paint,letting each coat dry for 1 hour between coats.Then apply a clear gloss or satin glaze.It is satin finish and is dishwasher safe after it has dried for 10 days.Cleans up with soapy water.......Lillie

Thanks! I am headed to Hobby Lobby this afternoon and will look for the products mentioned. Thanks for taking the time to reply to my question.

I thought you might have to use fine sandpaper to rough up the surface first. But perhaps those ceramic paints are designed to stick to smooth, glazed surfaces.

The ceramic paints are designed to stick to glazed surfaces and glass.I have never had a problem with them sticking and never sanded anything first.I just remembered too that several years ago I painted a ceramic lamp with the faux stone spray paint from Wal-mart.I just followed the instructions in the kit.I have had this lamp for more than 10 years and it still looks just as it did when I first painted it.No flaking,chipping or anything.You might try that if you like the look of the faux stone.........Lillie

I want to paint my canisters but they are porcelian how do you paint on that??

Any time you paint on glass, porcelain,china. You must have clean surface, was with soap & water & be sure all grease is off & then wipe off with alcohol being careful not to touch area you will be painting. Your fingers oils will mess it up. Use enamel paints you get at Walmart, Joane's, or Michael's it will say it's for glass & after it is painted it needs to sit for 30 days to cure.