If you should want to harden a donut, it should be a cake donut (no icing.) Put into a preheated oven on a cookie sheet, at 200* for 5 hours. Let cool and decorate with craft paint and glued on google eyes, etc. Paint again with craft paint and varnish. You could glue a magnet to the backside, and place on front of refrigerator. Donut will be rock hard.
Source: craft group, years ago. I did one.
By flor2007 from Valdosta, GA
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