Primer Selection Chart for Silicone Resins

Substrate Primer
Modified bitumen ( bleed blocking of asphalt substrates) Sikalastic-501 Primer
Metal manually cleaned (rust inhibitor) Sikalastic-501 Primer
Acrylic elastomeric coatings Sikalastic-501 Primer
Polyurethane elastomeric coatings Sikalastic-501 Primer
Concrete Sikalastic-502 Primer
Metal Sikalastic-502 Primer
Wood Sikalastic-502 Primer
Masonry Sikalastic-502 Primer
Polyurethane elastomeric surfaces Sikalastic-502 Primer
PVC Sikalastic- 503 Primer
FPO Sikalastic- 503 Primer
EPDM Consult Sika Rep
Hyalon Consult Sika Rep

Primer is not always required; always test adhesion before application.