The 700T Silicone Sealant is fast, neutral cure, low modulus sealant specially formulated for the PVC & roof line industry. This sealant is for perimeter pointing window & door frames, sealing plastic roof line areas & general weather sealing, it can also adhere to Timber, brick, stone, PVC, Concrete & Metal. This Silicone Sealant from Everbuild is okay for Internal & External use & contains anti-fungal compounds, this silicone is permanently flexible with a flexibility factor of 25% & also compatible for use with polycarbonate & acrylic sheets.