Begin by thoroughly washing each cheese grater with soap and warm water to remove any oils, residue, or dust. Dry them completely — any moisture on the surface will cause the paint to bead up and slide off rather than adhering properly. If you are working with brand new graters, they may have a light factory coating; a quick wipe down with a little rubbing alcohol on a cloth will help the paint bond better.
Step 2: Mix Your Pastel Paint
In a tall container, mix your chosen paint color with water, stirring until you achieve a consistency that is thin enough to be pourable but still carries enough pigment to leave a visible color on the metal surface. Start with roughly two parts paint to one part water and adjust from there. The paint should flow smoothly off a spoon in a thin, even stream — not too thick and gloopy, and not so watery that it leaves almost no color behind. Prepare one color per container if you plan to create multiple graters in different shades.
Step 3: Dip the Grater
Hold the grater by its handle and lower it slowly into the paint, stopping when approximately one-third to one-half of the grater is submerged. Hold it steady for about five to ten seconds, then slowly lift it straight up out of the paint in one smooth, continuous motion. As you lift it free, tilt it very slightly to encourage the excess paint to run down and drip off cleanly rather than pooling in the perforations. The perforations will naturally hold a little paint, which is exactly what creates that lovely textured, layered look once it dries.
