Start by washing the feet and drying them thoroughly, because the mask is intended to work directly on thickened skin. Apply a generous layer only to the problem areas, such as hardened heels, callused balls of the feet or rough pressure points. Do not spread it between the toes or over the thinner skin on the upper foot.
Leave the mask on for the time indicated on the product packaging. Because it contains 50% urea, it should not be treated like a leave-on daily cream unless the packaging specifically says so. A mild tingling sensation can occur with strong urea products, but burning, increasing discomfort or visible irritation is a reason to rinse it off and stop using it.
After the waiting time, mechanically remove the softened dead skin with a pumice stone or foot file, using gentle pressure rather than aggressive scraping. The aim is to lift loosened rough skin, not to forcefully thin the skin. Rinse the feet afterwards and dry them well. For ongoing care between mask sessions, a lighter urea foot cream can help maintain hydration and reduce the need for intensive exfoliation.
The product is generally used once or twice a week. If the skin feels tender, over-exfoliated or irritated, allow it to recover before using the mask again.