Single-component gunnable butyl rubber sealant for RV skylights, vents, windows, and termination rails. Adheres to TPO, EPDM, PVC, glass, metal, aluminum, concrete, wood, and plastics. Watertight and airtight primary seal, weather and UV resistant. Cures to a putty-like consistency. Gray, 10.1 oz tube.
The Dicor 451BSG-1 is Dicor's gunnable butyl rubber sealant — a single-component, solvent-release butyl-based sealant engineered to create watertight primary seals between lapping substrates and joints on RV roofs, skylights, vents, windows, and termination rails. It's the go-to sealant for sealing penetrations and overlapping seams on TPO, EPDM, and rubber roofing membranes where a flexible, paintable, weatherproof bond is needed.
The gunnable tube format is the key practical advantage over traditional butyl tape — the standard caulk gun application delivers a controlled, uniform bead with far less mess and waste than tape, provides more consistent coverage, and stores better over time. The sealant resists weathering, shrinkage, and cracking, and cures to a flexible putty-like consistency rather than a hard skin, maintaining its seal through the thermal expansion and contraction cycles that RV roofing experiences constantly. UV stabilized, gray color to blend with most RV roof surfaces.
• 1x Dicor 451BSG-1, 10.1 oz tube (gray) Application tips: • Clean all surfaces thoroughly — remove dirt, loose paint, rust, oil, and grease before applying • Apply at room temperature for easiest gunning • Apply at a 45° angle using constant pressure • Tool or join surfaces before material skins • Support tooled surfaces for 8 hours minimum • Remove excess with mineral spirits before skin forms
Gunnable butyl (451BSG-1 — this item): Best for applying a bead to a specific location — sealing around vent bases, window perimeters, or along termination rails where a controlled, uniform bead is needed. More precise, less waste, easier to keep neat than tape. Butyl tape (Dicor 501LSW or similar): Best for bedding flat flanges — placing under a vent flange or window frame before fastening, where even pressure will compress the tape into the joint. More uniform compression under fasteners. Many RV technicians use both — tape under flanges during installation and gunnable sealant to finish the perimeter after fastening.
The 451BSG-1 has a 1-year shelf life from the manufacture date. Check the tube for the manufacture date before use — aged butyl sealant may not gun properly or achieve a reliable seal. Store in a cool, dry location away from direct sunlight when not in use.