GAUDON alternative to Sikaflex 1a for joints up to 1/2 in sealant depth

If you currently run Sikaflex 1a on joints up to 1/2 in sealant depth, this page sets out the GAUDON option, what the published specifications say, and where the two products differ. It is written to help you decide, not to make a claim we can't support.

Recommended GAUDON alternative

GAUDON G2 Window & Door Silicone Sealant

One component neutral cure silicone for window and door perimeters, exterior trim, and weatherproofing around openings. Flexible, waterproof, low odor. Adheres to glass, aluminum, vinyl, PVC, brick, masonry, stone, and most compatible window and door substrates.

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Specification comparison

Chemistrymoisture-cured, 1-component, polyurethane-based, non-sag elastomeric100% silicone, Neutral Cure

ASTM C920 statusASTM C920, Type S, Grade NS, Class 35, Use T, NT, O, M, A, IMeets ASTM C920-18(2024)

Movement class±35% (ASTM C719)Not published in the GAUDON TDS

Interior / exteriorNot statedIndoor and outdoor use

PaintabilityPaintableNot paintable

UV / weather resistanceMarketing claim only, no test methodResists rain, sun and temperature swings; no cracking after 250 h Xenon accelerated weathering

VOC contentNot stated22.3 g/L, Rule 1168 compliant

Application temperatureRecommended application temperatures: 40° to 100°F40°F to 100°F

Service temperature-40 °F to +170 °F-40°F to 300°F (-40°C to 149°C)

Cure characteristicsTack Free Time 3 to 6 hours; Cure Time 4 to 7 daysApprox. 30 minutes · 24 to 48 hours

Packaging size10.1 fl. oz. (300 ml) cartridge; 20 fl. oz. (600 ml) sausage; 4.5 gal (17 L) in a 510.1 fl oz

Available colors9 colorsClear, Porcelain White, Gray, Black, Anodized Clear, Dark Bronze

Typical applicationsAll types of joints where max sealant depth will not exceed 1/2 inWindows, Doors, Exterior

Key differences

Chemistry differs: Sikaflex 1a is a moisture-cured, 1-component, polyurethane-based, non-sag elastomeric, G2 is a 100% neutral cure silicone. Confirm paint and substrate requirements before switching.
G2 is not paintable, and GAUDON does not publish a paintable product rated for this joint. If the joint must be painted, tell us the movement and exposure and technical sales will answer specifically.
Case pricing is quoted directly. Send a quote request with the quantity you need and we price it for you, then orders go by email or phone.

Different application?

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G2 Technical Data Sheet (TDS v2.0 · July 2026)G2 Safety Data Sheet

Competitor names and specifications are the property of their respective manufacturers and are referenced for comparison only. Recommendations are based on published product information. Always review the applicable GAUDON TDS and confirm project-specific compatibility before use.