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̶P̶i̶s̶s̶ ̶o̶n̶ ̶t̶h̶e̶m̶ smear it with your egg yolk mixed with water..
If you have those fancy brushes for cakes then good for you - now you can finally use it.
But if you lack of such things, then good for us - use a spoon like a common folk.