LOOF PROFESSIONAL- KERATIN WELDING AND MICRO WELD REMOVER SPRAY. Instructions for Use: 1 - Spray our LOOF Keratin Weld Remover spray on your micro or Keratin welds. 2- Apply the spray to your source using your hand for 3-5 seconds. 3- With the help of pliers, clamp the hair extension and separate the extension hair from your own hair.