Magic Crystal works by gradually wearing down the surface layer of the hair, using a process called micro-cuticle-abrasion.
To be effective, only the gentlest pressure is required, so that the hair swirls around but the skin stays still.
The outer, cuticle, layer of each hair is much more robust than the cortex and cement within. While the cuticle is being worn away it can feel as though nothing is happening. It's important not to be tempted to apply any extra pressure.
As soon as the cuticle has been removed, the rest of the hair disappears very rapidly. There's no plucking and no cutting. Each hair is ultimately worn to a fine point right at the skin surface. This almost eliminates the risk of ingrown hair. The fine tip also significantly reduces the appearance of regrowth, especially compared to shaving which leaves a large cross-section of hair to grow back.
Magic Crystal is a very effective exfoliator so it needs to be used with care. The application of too much pressure or over-use on a single area can cause irritation.
You should avoid using Magic Crystal on parts where the skin is particularly delicate or sensitive such as the face and the more tender areas beneath the bikini line. This is because of the need to use very gentle pressure that moves the hair around without moving the skin.
You should also only use Magic Crystal on clean dry skin that is not tacky to the touch. So definitely not after a long soak. Only apply creams, oils or lotions to your skin after using Magic Crystal, never before.
Not only does this risk clogging the surface it will also slow the hair removal and increase risk of skin irritation.