The bonding or vehicle in tempera can sometimes not adhere to other surfaces. I have found that using a small amount of white glue mixed with the tempera can help it adhere to all surfaces.
San Jose, CA
--- On Fri, 3/12/10, menichino <firstname.lastname@example.org> wrote:
> From: menichino <email@example.com>
> Subject: [teacherartexchange] plaster and tempera
> To: "TeacherArtExchange Discussion Group" <firstname.lastname@example.org>
> Date: Friday, March 12, 2010, 7:57 PM
> 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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