FLEX PRO 230™ is a premium 100% acrylic elastomeric sealant that features superior elongation and recovery. This sealant offers excellent durability and forms an airtight, water resistant seal which can be painted. Once cured, the bead is mildew resistant. With 60 year durability, it exceeds Fed. Spec. TTS-00230C and ASTM C-920, Class 12.5.