You can do this in the bathroom or even inside the dishwasher for easy cleanup with hot water once you’re done. Alternatively, use a large cardboard box and place your mousse cake on a rotating tray inside. Choose the setup that works best for you, but keep in mind, it’s a very messy process!

The quantity shown in the photos was enough for two entremets.

Melt the white chocolate and cocoa butter in a double boiler. You can melt them together in the same container.

Stir to combine, then add the fat-soluble coloring.

Blend with the immersion blender. Add more coloring if you want a deeper shade.

Pour the mixture through a fine sieve into the spray gun reservoir and use immediately at 42°C (107.6°F).

For smaller quantities, pour the mixture into a small jar or container before placing it into the reservoir.

Remove the mousse cake from the freezer and unmold it onto a cake turntable, if possible. Gently run your hand over the surface to remove any frost.

Test your spray gun on the side before spraying the mousse cake. This helps avoid the initial sputter that can create unattractive clumps on the surface.

Hold the spray gun about 30 cm (12 in) from the mousse cake and spray in continuous, sweeping motions from left to right, then right to left, while turning the cake turntable with your other hand.

Once the mousse cake is evenly coated, stop spraying. Avoid applying too thick a layer, as it may cause the velvet texture to crack. (Refer to the tips at the beginning of the article.)

Transfer the mousse cake to a serving dish and decorate as desired. Let it thaw for 6 hours in the refrigerator or 2 hours at room temperature, slow defrosting gives the best texture.

You can safely refreeze a mousse cake with a velvet texture.

Once your mousse cake is in the refrigerator, clean the spray gun immediately, following the tips mentioned above.

If you have any leftover glaze, store it in an airtight container in a dry place until the next use. You can reheat it in a water bath or microwave before using it again.

I hope this article helps you select the right spray gun and master the art of perfectly spraying your mousse cakes for a stunning presentation.