Our light brown waterproof hair mask is carefully formulated with glycerin， polydimethylsiloxane and glycerin stearate. Specifically designed to effectively cover bald areas， instantly enhance one's image， and restore confidence and charm， it seamlessly connects natural hair strands. The usage method is extremely convenient: 1. Pre-dyeing test: Please conduct a skin sensitivity test before use. If symptoms such as redness， swelling， itching， or burning occur， stop using it immediately and wash off any remaining product. 2. Make sure your hair is dry before use. 3. Wear protective equipment when operating and apply face cream to areas that may come into contact with the skin， such as the face， neck， behind the ears and arms. 4. Apply the hair dye evenly to your hair， making sure each strand is covered by it. Wait for 15 to 30 minutes to allow the dye to fully penetrate your hair. 5. Rinse your hair with clean water and dry it. And it can precisely modify the hairline， fill in sparse gaps， shape a perfect face， add fashionable charm. With a long-lasting waterproof and sweat-proof formula， it maintains a concealer effect all day long， is not afraid of sweat or rain， and does not smudge makeup for a long time.