Concealer should be invisible on the skin, so you should always remember that "less is more". Aside from matching the colour of your concealer to your foundation, you'll get the best results if you invest in a good concealer brush. Place the product on the back of your hand, then use your brush to conceal any imperfections. Patting the product into your skin will give more intense coverage, while blending it will produce a more sheer effect.