Berkland Marine Adhesive Sealant 5200 Fast Cure — 10 oz White, Permanent Waterproof & Fast-Curing

Berkland Marine Adhesive Sealant 5200 Fast Cure is a professional-grade, permanent waterproof sealant and adhesive for above- and below-waterline marine applications.

Designed for boaters, builders, and repair professionals, this 10 oz white cartridge delivers a fast-curing version of the trusted 5200 formula. It bonds to fiberglass, gelcoat, wood, metal and many plastics, forming a durable, flexible joint that resists UV, salt spray and weathering. The single-component, solvent-free formula skins quickly and reaches handling strength within about 24 hours so you can finish installations and return vessels to service faster than traditional 5200 products.

How quickly will this sealant set and when can I handle the joint?

The Berkland 5200 Fast Cure is formulated to skin over in roughly one hour and reach handling strength in about 24 hours under normal conditions. Cure time can vary with temperature and humidity: warmer, drier air speeds cure while cold or wet conditions slow it.

• Skins in ~1 hour under typical shop conditions
• Handling strength around 24 hours at moderate temperatures
• Suitable for above- and below-waterline use once cured
• Cold weather may extend cure time—allow extra days before heavy loading

What materials and parts can I use it on?

This sealant bonds to most substrates found on boats: fiberglass, gelcoat, wood, aluminum, steel and many plastics. It is appropriate for through-hull fittings, deck hardware, transducers, rail stanchions and bedding portlights or windows where a permanent, watertight bond is required.

• Fiberglass hulls, gelcoat surfaces, and wood trim
• Metal fittings, aluminum and stainless steel hardware
• Deck fittings, through-hull fastenings, transducers and struts
• Marine flooring, carpet bonding and portlight bedding

Will the sealant stand up to sun, saltwater and movement?

Berkland's 5200 FC is engineered to resist UV degradation, salt spray and the mechanical stresses of hull flex, vibration and wave impact. The cured bond remains flexible enough to absorb movement without cracking or losing adhesion, making it a long-lasting choice for exposed marine joints.

• UV-resistant—resists chalking and breakdown in sun
• Saltwater/spray resistant—suitable for marine environments
• Flexible, permanent bond—handles vibration and flexing
• Will not crack, shrink or peel under normal conditions

How easy is it to apply and what should I expect from the cartridge?

The product is a ready-to-use, single-component sealant that requires no mixing—just load a standard 10 oz caulk gun and apply. It’s formulated to be low-VOC and non-toxic when used as directed; disposable gloves are included for cleaner handling and better control during application.

• 10 oz cartridge fits standard caulk guns for familiar application
• No mixing or primers required for most substrates
• Solvent-free, low-VOC formula with included gloves
• Tool within recommended working time for clean joints

Who is this for? Berkland 5200 Fast Cure is aimed at boat owners, marine mechanics, shipwrights and yards who need a permanent, weatherproof seal with faster turnaround than classic 5200. If you install through-hulls, mount hardware, repair decks or bed portlights and want a reliable, UV-resistant bond that cures quickly for return-to-water timelines, this product is built for those tasks.