Bostik Roof & Gutter is a premium one component, mid flex, neutral curing 100% silicone roof sealant, which provides excellent adhesion to many common substrates in plumbing and roofing applications. Can be used with Steel (including COLORBOND and ZINCALUME ), aluminium, glass, concrete, brick, ceramics, and terracotta roof tiles. WaterMark approved. Excellent adhesion to decorative sheet metal and masonry/brick surfaces. Suited to roofing, general plumbing, weather sealing and general purpose sealing. Suitable For: Plumbing applications Roof and gutter applications Metal roofs Metal water tanks Spouting/flashing Downpipes Lap joints Skylights Flues and extraction units Pipe and sprinkler system penetrations Air conditioning ducting Sheet-metal fabrications.