Tempera paint does not have a binder that will adhere to plaster. It would chip off a plaster wall as well.
To save those projects I would dilute white school glue with enough water to make it spreadable, and, with a wide brush, coat all the painted projects. The glue might act as a seal.
in the future, use a acrylic paint for those projects.
Barbara from Boston
On Mar 12, 2010, at 10:57 PM, menichino wrote:
> Hi folks -- has anyone had trouble with tempera paint chipping off
> plaster craft? Our 2nd graders made plaster bowls and painted them to
> look like Egyptian treasures. The tempera chipped off, especially the
> black, and I made it a point to use premier quality paint.
> Suggestions, anyone?
> Liz in thawing rural NY
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