It is used for the pre-treatment of the road surface before the hot melt marking is applied. It is a tool for moistening the bottom oil to enhance the adhesion between the marking line and the road surface. Hot Melt paint application of the marking paint primer can avoid the appearance of peeling off of the coating film and cracking of the coating film in the construction of the hot melt marking line. And promote construction Quality. Make the markings attach more firmly. The use of this machine greatly reduces the labor intensity and speeds up the construction progress.