Description
ARBOSeal Pro® Range – Arbomast GP
Traditional oil-based sealant for general pointing and sealing
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
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Reliable sealing – Ideal for perimeter sealing of timber frames and joints between preformed concrete panels (e.g., garage construction).
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Overpaintable – Can be painted after application (always pre-test for compatibility).
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Durable & flexible – Maintains pliability for years, ensuring dependable results.
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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
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Surfaces must be clean, dry, and free from dust, grease, or contamination.
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Degrease with a suitable ARBO® Cleaner.
Joint Backing
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Use an appropriate joint filler (e.g., closed-cell polyethylene foam) to achieve correct joint depth.
Sealant Application
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Apply Arbomast GP from 380ml polyethylene cartridges using an ARBO® Caulking Gun.
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Prepare and apply in line with BS 8000-16:1997 + A1:2010 (British Standard for sealing building joints).
Technical Data
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Tack-Free Time (20°C / 65% RH): ~24 hours (forms skin in approx. 14 days, depending on conditions)
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Application Temperature: +5°C to +40°C
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Service Temperature: -25°C to +70°C
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Movement Accommodation:
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Butt joints (tension/compression): 10%
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Lap joints (shear): 20%
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Chemical Resistance: Resistant to most dilute acids and alkalis
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UV Resistance: Good (slight yellowing may occur on light colours)
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Service Life: 10+ years (improved by overpainting)
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Colours: Grey, Black, White
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Joint Dimensions:
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Width: 6–20mm (single application)
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Depth: 10mm (porous), 6mm (non-porous), max 20mm
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Width/depth ratio: 2:1 (butt joints), 1:1 (lap joints)
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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.
