Firestone Lap Sealant is designed to seal and mechanically protect the exposed edges of all field fabricated splices in EPDM or Butyl flashing materials.
Stocked in quart size caulking tubes.
https://www.constructionmidwest.com/components/com_mijoshop/opencart/download/203822016TIS 1308 Lap Sealant HS.pdf
https://www.constructionmidwest.com/components/com_mijoshop/opencart/download/676529996FIRESTONE LAP SEALANT HS.pdf