The HE104 - Asphalt Primer readily penetrates the pores of the surface to which it is applied and provides a firm bond for asphalt coatings - cold or hot and cutback or emulsions. The HE104 - Asphalt Primer is a thin, penetrating asphalt based material for priming surfaces prior to the application of hot mopped or cold applied asphalt coatings, or cold applied adhesive , roof adhesives and cements.