Arbomast GP Black 380ml – Oil-Based Pointing Sealant (ARBOSeal Pro®)

Description ARBOSeal Pro® Range – Arbomast GP Traditional oil-based sealant for general pointing and sealing Also known as Arbomast GP, part of the ARBOSeal Pro® Range, is a one-part, oil-based sealant designed for traditional construction applications. It forms a protective surface skin while the bulk of the material remains pliable for years, providing long-lasting performance in general pointing and joint sealing. Key Features Reliable sealing – Ideal for perimeter sealing of timber frames and joints between preformed concrete panels (e.g., garage construction). Overpaintable – Can be painted after application (always pre-test for compatibility). Durable & flexible – Maintains pliability for years, ensuring dependable results. Good chemical & UV resistance – Suitable for most exterior environments. Not recommended for: Expansion joints or those subject to high movement Use against natural stone Interior applications Application Instructions Joint Preparation Surfaces must be clean, dry, and free from dust, grease, or contamination. Degrease with a suitable ARBO® Cleaner. Joint Backing Use an appropriate joint filler (e.g., closed-cell polyethylene foam) to achieve correct joint depth. Sealant Application Apply Arbomast GP from 380ml polyethylene cartridges using an ARBO® Caulking Gun. Prepare and apply in line with BS 8000-16:1997 A1:2010 (British Standard for sealing building joints). Technical Data Tack-Free Time (20°C / 65% RH): ~24 hours (forms skin in approx. 14 days, depending on conditions) Application Temperature: 5°C to 40°C Service Temperature: -25°C to 70°C Movement Accommodation: Butt joints (tension/compression): 10% Lap joints (shear): 20% Chemical Resistance: Resistant to most dilute acids and alkalis UV Resistance: Good (slight yellowing may occur on light colours) Service Life: 10 years (improved by overpainting) Colours: Grey, Black, White Joint Dimensions: Width: 6–20mm (single application) Depth: 10mm (porous), 6mm (non-porous), max 20mm Width/depth ratio: 2:1 (butt joints), 1:1 (lap joints) Packaging & Storage Supplied in 380ml polyethylene cartridges. Store in a cool, dry place away from direct sunlight. Keep cartridges sealed until use. Health & Safety Use only in well-ventilated areas. Avoid skin and eye contact. Always consult the product’s Safety Data Sheet (SDS) before use.