The basics The Adhesion Aid has been designed to be used when you are in front of peeling problem on leather edge. The uses It must be used in combination with Basecoat Dense and its purpose is to help Basecoat in penetrating deep into the leather, improving the adhesion of the paint on the leather edge. The pro tip We recommend to use the Adhesion Aid by mixing it with the Basecoat Dense. The bottom line Generally the proportion for use is: 1L of Basecoat Dense mixed with 250ml of Adhesion Aid.