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I am using a apricot jam glaze to decorate the top of a Christmas fruitcake (made using rum soaked dryfruits and fed with rum after baking). This kind of fruitcake really lasts long due to alcohol in it. Now I am using a apricot jam glaze to put some nuts on top to decorate it. (could not get the nuts to stay in place during baking) Since glaze is made by heating jam with some water, does this glaze affect how long the cake will last?

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No, the glaze will make very little difference. Jam is 60% sugar and sugar is an excellent preservative. To put it another way: if you find jam keeps well in the pot, the same should hold once it's on the cake.

  • Two points... the jam glaze is apparently thinned with water, which will make it less stable, and the storage conditions of jam may be different from the storage of the cake (sealed in a jar vs open air is one thing, refrigerated vs countertop depends on the cake). It may hold up quite well, especially if the glaze dries off some, but one should be aware of the possibilities. – Megha Jan 14 at 6:40

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