4200 Fast Cure White – 3 oz.

3M Marine Adhesive/Sealant Fast Cure 4200 (White) is a one-part general purpose polyurethane that chemically reacts with moisture to create flexible bonds and weather-resistant seals. Its paintable and sandable for finishing, and its designed for marine applications above or below the waterline where disassembly may be desired.

Key Features

• One-part polyurethane sealant/adhesive that chemically reacts with moisture
• Flexible bonds with good adhesion to common marine substrates
• Paintable and sandable for easy finishing
• Helps form watertight, weather-resistant seals on joints and marine hardware above or below the waterline
• Fast cure for rapid results (tack-free in about 1 hour; typically cures in about 24 hours)

Intended Use

• Marine sealants and adhesives for bonding/sealing jobs
• Sealing joints and marine hardware applications (above or below the waterline)
• Projects using substrates such as wood, fiberglass, gelcoat, and compatible metals/plastics

Product Details

• Product: 4200 Fast Cure White – 3 oz.
• Brand: 3M
• Part number / SKU: 71-05260
• Color: White
• Container size: 3 fl oz (US) (88.7 ml)
• Adhesive type: Polyurethane
• Tack-free time: about 90 minutes
• Typical cure time: about 24 hours
• Product barcode (variant): 51135052600 (as listed)
• Package/quantity note: This listing is for the 3 oz tube (single item).

Parts Desk Insights

Best Use Case: Use for marine bonding and sealing where you want a flexible, weather-resistant polyurethane sealant with the ability to sand and paint after curesuch as sealing joints or mounting hardware on boats.

Common Issues: For best results, prep and clean mating surfaces before application. Because this is a fast-cure polyurethane, moisture-triggered curing can progress quicklywork efficiently, ensure proper squeeze-out/coverage at the joint, and verify compatibility on any plastics before committing the job.

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