3M 06580 Marine Adhesive Sealant 4000 UV Fast Cure White 10 oz Cartridge | Medium-Strength UV-Resistant Polyurethane | Rub Rails, Stern Joints, Deck & Through-Hull Fittings

3M 06580 Marine Adhesive Sealant 4000 UV Fast Cure White 10 oz Cartridge — Medium-Strength UV-Resistant One-Component Moisture-Curing Polyurethane Adhesive Sealant | Rub Rails, Stern Joints, Deck & Through-Hull Fittings | Above & Below Waterline

3M Marine Adhesive Sealant 4000 UV Fast Cure is a one-component, medium-strength, moisture-curing, gap-filling polyurethane adhesive sealant with excellent UV resistance formulated for reliable long-term performance in exposed marine applications. Cures to form a firm, flexible, and waterproof seal on aluminum, wood, gel coat, and fiberglass above or below the waterline. Medium strength allows for disassembly — joints can be opened for service or replacement. Fast cure: skin time 15–20 minutes, full cure in approximately 24 hours. White color. 10 oz cartridge for use with a standard caulking gun. Ideal for rub rails, stern joints, deck and through-hull fittings, and access plates.

Part Specifications

• Part Number: 3M-06580
• Product Line: 3M Marine Adhesive Sealant 4000 UV Fast Cure
• Color: White
• Size: 10 oz cartridge (caulking gun)
• Chemistry: One-component, moisture-curing polyurethane
• Bond Strength: Medium — allows for disassembly
• UV Resistance: Excellent — formulated for UV-exposed above-waterline applications
• Substrates: Aluminum, wood, gel coat, fiberglass
• Application: Above and below the waterline
• Cured Properties: Firm, flexible, waterproof seal
• Skin Time: 15–20 minutes
• Full Cure Time: Approximately 24 hours
• Typical Applications: Rub rails, stern joints, deck fittings, through-hull fittings, access plates
• Also Available: 3 oz squeeze tube (3M-05280)

06580 vs 05280 — Choosing the Right Size

3M Marine Adhesive Sealant 4000 UV Fast Cure is available in two sizes — same formula, different format and volume:

• 3M-06580 (10 oz cartridge — this product): For use with a standard caulking gun. Higher volume suited for full rub rail runs, multiple fittings in a single session, production installations, or any application where a larger quantity of sealant will be applied. More economical cost-per-oz for higher-volume applications. Requires a caulking gun.
• 3M-05280 (3 oz squeeze tube): Squeeze tube — no caulking gun required. Suited for single fittings, spot repairs, occasional use, onboard storage, and applications where portability and ease of use without a caulking gun is preferred. More convenient for single-joint applications.

4000 UV in the 3M Marine Sealant Line

3M 4000 UV occupies the medium-strength serviceable position in the 3M marine polyurethane sealant line — positioned between the lighter-hold serviceable options and the permanent 5200. Key positioning:

• vs 3M 5200 (permanent): 4000 UV is medium strength and allows disassembly for service; 5200 is permanent and separation after cure typically damages bonded surfaces. Use 4000 UV for hardware that may need to be removed; use 5200 only for structural joints that will never be serviced.
• vs 3M 4200 (strong, serviceable): 4000 UV is medium strength with excellent UV resistance; 4200 is a stronger serviceable sealant suited for higher-load deck hardware and through-hulls. Use 4000 UV where UV resistance and ease of disassembly are priorities; use 4200 where a firmer serviceable hold is needed.
• UV resistance advantage: The UV-resistant formulation makes 4000 UV the preferred choice for above-waterline rub rails, exposed deck fittings, and any joint that remains in continuous direct sunlight, where standard polyurethane sealants can degrade, discolor, or lose flexibility over time.

Application Notes

• Requires a standard caulking gun — cut the cartridge tip at a 45° angle to the desired bead size and load into the gun before applying
• Surface preparation: surfaces must be clean, dry, and free of grease, oil, wax, and loose material; clean with acetone or isopropyl alcohol and allow to dry completely
• Apply a continuous bead and tool to the desired profile within the 15–20 minute skin time window; in warm or humid conditions, tooling time is shorter
• Moisture initiates cure — ambient humidity cures from the outside in; higher humidity and warmer temperatures accelerate skin time
• Full cure approximately 24 hours — do not stress the joint or immerse below the waterline until fully cured
• Uncured product can be cleaned up with acetone or MEK; cured product must be cut or abraded for removal
• Wear gloves — uncured polyurethane is difficult to remove from skin and clothing

Additional Information

• Vendor: 3M
• SKU: 3M-06580
• Product Type: Boat & Engine Maintenance / Adhesives & Sealants
• Color: White
• Size: 10 oz cartridge
• Country of Origin: USA
• HS Code: 3506.10 (products suitable for use as glues or adhesives, put up for retail sale — verify for your import classification)

Frequently Asked Questions

Q: What is the difference between 3M-06580 (10 oz cartridge) and 3M-05280 (3 oz squeeze tube)?
A: Same 4000 UV Fast Cure formula — different size and format. The 10 oz cartridge (06580) requires a caulking gun and is suited for full rub rail runs, multiple fittings, and higher-volume applications where more sealant will be used in a single session. The 3 oz squeeze tube (05280) requires no caulking gun and is suited for single fittings, spot repairs, and onboard or occasional use.

Q: What does the “UV” in 4000 UV mean, and why does it matter?
A: The UV-resistant formulation is specifically designed for applications exposed to direct sunlight and UV radiation. Standard polyurethane sealants can degrade, discolor, or lose flexibility over time when continuously exposed to UV. 4000 UV resists this degradation, making it the appropriate choice for rub rails, exposed deck fittings, and above-waterline hardware in continuous sunlight.

Q: What is the difference between 3M 4000 UV and 3M 5200?
A: Bond strength and permanence. 4000 UV is medium strength and allows disassembly for future service. 5200 is permanent — separation after full cure typically requires cutting or grinding and damages bonded surfaces. Use 4000 UV for deck fittings and hardware that may need service. Use 5200 only for structural bonds that will never need to be disassembled.

Q: Can this product be used below the waterline?
A: Yes — rated for above and below the waterline. Allow full cure (approximately 24 hours) before immersing below the waterline.

Q: Do I need a specific caulking gun for the 10 oz cartridge?
A: A standard 10 oz caulking gun is required. Cut the cartridge tip at a 45° angle to the desired bead width before loading. Standard pistol-grip or ratchet-drive caulking guns are compatible with the 10 oz cartridge format.