It is easier to use this glaze when it is at a slightly warmer temperature. So you can either warm your glaze, or dip a warm donut in the glaze. It’s especially good to have a warm glaze for more delicate donuts. In order to warm your glaze, use a double boiler (or bain-marie). A double boiler is a pot with a low level of simmering water, with the glaze-filled bowl placed on top.