Check out this Product Demonstration
The white release liner easily pulls away from the mastic. Start at one edge of the joint to the other end. Cut the material with a straight edge.
As the white release liner is pulled back place/tack the exposed mastic onto the joint it will adhere to the dry & clean pavement surface
Once the joint is completely covered from edge to edge and is trimmed. Use a torch continually passing the heat to liquefy the mastic.