The retouched parts, with time are not subject to atmospheric deterioration keeping the original shade, even when treated with small amounts of product. Apply on the interested area with a brush and wait for the product to impregnate the wood. To clean the wood from smudges or drops lost during the operation, just use a damp cloth soaked in nitro thinner. Smooth over with a cloth before it is fully dried. If colours don’t match perfectly with the surface, mixing of different shades is possible.