4200 Fast Cure Black - Cart.
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
3Mâ„¢ 4200 Fast Cure Black is a one-part general purpose polyurethane adhesive/sealant that chemically reacts with moisture to form flexible bonds with strong adhesion to many common marine and construction substrates.
Key Features
- One-part polyurethane—chemically reacts with moisture to cure.
- Flexible bonds with good adhesion to wood, fiberglass, gelcoat, certain plastics, and metals.
- Paintable and sandable after cure.
- Helps form watertight, weather-resistant seals on joints and around hardware above or below the waterline.
- Designed for easier part disassembly than 3Mâ„¢ 5200 (about half the strength).
Intended Use
- Marine bonding and sealing jobs (general-purpose use).
- Sealing joints and hardware above or below the waterline.
- Repairs and re-bedding applications where a flexible, paintable/sandable polyurethane sealant is desired.
Product Details
- Product name: 4200 Fast Cure Black - Cart.
- Brand: 3M.
- Product type: Caulks, Sealants & Adhesives.
- Color: Black.
- SKU: 71-06564.
- Variant packaging details (from listing): Cart. (cartridge).
- One-part polyurethane adhesive/sealant.
- Chemically reacts with moisture to cure.
- Adhesion substrates listed: wood, fiberglass, gelcoat, certain plastics, metals.
- Finish/cosmetic: paintable and sandable.
- Seal performance described: forms watertight, weather resistant seals on joints and hardware above or below the waterline.
- Strength guidance described: approximately half the strength of 3M 5200 to allow disassembly of parts.
- Net weight (from listing): 376 grams.
Parts Desk Insights
Best Use Case: Best suited for general-purpose marine sealing/bonding where you want a flexible polyurethane joint seal, plus the ability to paint or sand for finishing, and the option for easier disassembly compared with 3Mâ„¢ 5200.
Common Issues: For best results, ensure the mating surfaces are properly prepared before application (clean, dry, and free of contaminants). Because it cures with moisture, curing performance can be affected by application conditions—plan for normal cure behavior before sanding/finishing.
Related Products & Accessories
- Browse Sealants & Adhesives - Explore additional marine sealants and adhesives for comparable bonding/sealing needs.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.