HB42 Ultimate Decorators Caulk 380ml – Professional Flexible Acrylic Sealant

Description HB42 Ultimate Decorators Caulk – Professional Flexible Sealant HB42 decorators caulk is a flexible, paintable acrylic sealant designed for filling gaps, cracks and joints in interior and exterior decorating applications. Ideal for use around skirting boards, window frames, door trims and plaster, this decorators caulk provides a smooth, professional finish and can be painted over in just 1 hour. What Is Decorators Caulk Used For? Filling gaps between skirting boards and walls Sealing around window and door frames Filling cracks in plaster and masonry Finishing joints before painting Sealing trims, architraves and cornices When to Use Decorators Caulk Use decorators caulk when: You need a paintable sealant You’re filling internal gaps and cracks You want a smooth finish before decorating Key Benefits Flexible & Durable: Accommodates joint movement of up to 12.5%, ideal for cracks, gaps, and construction joints. Quick Over-Paint: Emulsion paints can be applied within 1 hour; oil-based paints after 24 hours. Fungicide Protected: Reduces risk of mould growth in damp areas. Versatile Applications: Works on windows, architraves, cornices, PVC trims, plasterboard, skirting boards, and masonry. Adhesive Capabilities: Can also bond polystyrene panels. Applications Sealing around window frames, doors, cornices, architraves, PVC trim, and cladding. Filling cracks and gaps in plaster, brickwork, stone, and concrete. Suitable for construction and internal decoration joints up to 25mm wide and 20mm deep. Limitations Not suitable for surfaces like PE, PP, Teflon, bituminous membranes, or areas below ground level. Should not be applied below 5°C or in constantly wet conditions. Technical Specifications Property Details Composition Acrylic polymers and fillers Form Ready-to-use paste Specific Gravity 1.64–1.68 Tack-Free Time 15 min – 1 hour (depending on conditions) Full Cure Up to 1 week (depending on joint size and conditions) Application Temp Range 5°C to 40°C Service Temp Range -20°C to 70°C Joint Movement Capability 12.5% Maximum Joint Size 25mm wide x 20mm deep Shelf Life 12 months in unopened cartridges under cool, dry conditions Life Expectancy Up to 12 years when applied correctly Compliance EN ISO 11600 F 12.5P, CE marked BS EN 15651 Type F-EXT-INT Directions for Use Ensure surfaces are clean and free of dust, grease, or loose material. Apply in dry conditions at 5°C to 40°C. Cut nozzle at a 45° angle to match joint width; use masking tape for neat edges. Apply using a skeleton gun and ensure solid fill. Smooth with a wet spatula immediately. Need a gun? Use with a standard cartridge gun for easy application. Over-paint emulsion paints within 1 hour; oil-based paints after 24 hours. Storage & Cleaning Store in a cool, dry place between 5°C and 25°C. Protect from frost. Clean tools and surfaces with water immediately after use. HB42 Ultimate Decorators Caulk delivers a professional, long-lasting finish for both home and commercial projects, combining flexibility, durability, and ease of application. FAQ Is decorators caulk paintable? Yes, this caulk can be painted with emulsion within 1 hour. Can decorators caulk be used outside? It can be used externally in sheltered areas, but silicone is better for exposed weather. What’s the difference between caulk and silicone? Caulk is paintable and used for finishing, while silicone is waterproof and flexible but not paintable.