3M 7000121531 | 05280 3 fl oz White Marine Adhesive Sealant

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2.39 LBS
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3M Marine Adhesive Sealant 4000 UV is a one-component, medium-strength, moisture-curing, gap-filling sealant that cures to form a firm, flexible and waterproof seal on aluminum, wood, gel coat and fiberglass, making it well-suited for marine applications above or below the waterline. This product offers excellent UV resistance for reliable long term performance.

3M Marine Adhesive Sealant Fast Cure 4000UV is a tough, flexible, semi-permanent marine sealant for strong, sharp seals on RVs, boats and other watercraft. Formulated for color stability and UV resistance, it is especially suitable for areas which are exposed to the sun and wherever flexibility is important. This marine adhesive is great for cosmetic seals over permanent adhesive material. It becomes tack-free in as little as 22 minutes and it typically cures in as little as 24 hours. It is also immediately paintable after curing-so you can get right back out on the water. Marine grade sealant applies right from the container with no mixing required and cures to form a firm, flexible, waterproof seal. Yet its medium-strength adhesive allows you to disassemble boat parts without damaging them after long-term use. It is ideal for use on wood, glass, gelcoat and fiberglass as well as many metals and plastics and recommended for topside components like hatches, portlights, metal hardware as well as porthole seals. Like our 4200 marine sealant adhesive, it dissipates stress caused by vibration and shock and won’t crack under dynamic force. It resists salt, wind, weather and temperature extremes just as effectively for years of worry-free enjoyment on the water.


  • Excellent UV Resistance-Resists fading and color change from the sun, ideal for topside use where appearance is important
  • Cures Fast-Requires no mixing, typically cures in as little as 24 hours so you can get back on the water faster
  • Long Lasting Formula-Tough polyurethane polymer resists weathering and saltwater
  • Won’t Crack or Peel-Stays flexible, retaining strong bonds during vibration, structural movement or shock
  • Allows for Disassembly without Damage-Medium-strength, semi-permanent adhesive sealant allows for bonded parts to be removed after prolonged use
Product Specifications
Manufacturer Part Number7000121531
Adhesive TypeSilane Modified Polymer
Application MethodHand or pressure caulk
Color FamilyWhite
Container Size (Inch)3.0 fl oz (US)
Full Cure Time>3.5 mm/24 hr
Hardness40 Shore A
Modulus at 100%>250 Pound-Force Per Square Inch
Physical FormMedium paste
Product ColorWhite
Product FormTube
Product Number4000 UV
Solids Weight Percent (Approximate)98 %
Substrate 1ABS
Substrate 2Cold Rolled Steel
Surface TypeMetal
Tack-free Time20 min
Tensile Strength (Inch)500 psi


This product can expose you to materials and/or chemicals including arsenic, lead, and other materials and/or chemicals which are known to the state of California to cause cancer and/or reproductive harm.

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