EPDM Liquid Rubber can be applied over asphalt roofing as follows:
Built up asphalt roofs-You would first need to apply the ProFlex Primer before applying the liquid EPDM.
Modified asphalt roll roofing - First needing the ProFlex Primer
Asphalt Shingles-For the Asphalt substrates there cannot be any separation between layers. Cracked ridges must be cut out and filled with PROFLEX and rubber mix plus reinforced with POLY FABRIC.