Prime-Tek TPO Primer is a low-VOC, solvent-based primer designed to promote optimal adhesion of AcryShield acrylic and Pro-Grade silicone coatings to new or existing TPO. Prime-Tek TPO Primer is to be used exclusively on TPO membranes and is not compatible with EPDM or PVC membranes. Prime-Tek TPO Primer is slightly tinted to distinguish primed areas on bright white TPO membranes.