I have painted this Prego Jar with patchwork design using Gloss Enamel Paint. Then I bake it to have a lasting effect in a normal oven at 150c for 35 minutes. The metal cap also I painted with checkered design but I brush a layer of varnish instead of baking it.
You can get the Gloss Enamel paint at Creative Cottage, Amcorp Mall PJ or order thru online :
http://www.creativecottageonline.com/eshop/m-deco_enamel.php