Sorry, I somehow missed the beginning of this thread.

Here is a heat and humdity-proof frosting recipe that tastes amazingly
like whipped cream:

* Exported from MasterCook *

Creamy White Frosting

Recipe By :Gail Wallen
Serving Size : 18 Preparation Time :0:20
Categories : Cakes and Frostings Signature Dishes

Amount Measure Ingredient -- Preparation Method
-------- ------------ --------------------------------
1/2 cup butter
1/2 cup shortening
1 cup sugar
1 egg white -- beaten foamy*
2/3 cup skim milk -- lukewarm
1 teaspoon vanilla

1. With electric mixer, cream together the butter, shortening, and
sugar.
2. Add egg white and beat well.
3. Add milk and vanilla, and beat for 10 minutes.

Description:
"This luscious frosting tastes like whipped cream!"
Source:
"RFC 3/10/1999"
- - - - - - - - - - - - - - - - -

NOTES : Stands up well to heat and humidity.

For just us, I use a real egg white. For others, I use powdered egg
white that I buy he
http://www.maidofscandinavia.com/

Frosts: 2 - 9" layers or 1 -13x9" oblong