Flex Seal Power Putty Moldable Waterproof Sealant — White 16 oz, Instant Underwater Repair, Reusable

Flex Seal Power Putty is a moldable, waterproof rubberized sealant that instantly fills and seals gaps, cracks, and holes — even underwater — and can be removed and reused.

Whether you're patching a leaky pipe, repairing a boat, or creating an emergency auto fix, this white 16 oz Power Putty arrives ready-to-use and requires no tools, mixing, or drying time. Its hand-shaped consistency forms a tight, flexible barrier on contact and adheres to a wide range of materials including metal, plastic, wood, and fiberglass. Designed for fast repairs, it works on wet or damp surfaces and can be repositioned or removed as the situation demands.

How quickly will it stop a leak?

Power Putty is engineered for immediate contact sealing: it creates a waterproof, airtight barrier as you press it into place. This fast-setting behavior makes it useful for urgent fixes where you need water or air flow stopped right away.

• Adheres instantly to wet and submerged surfaces
• No cure time needed to achieve a temporary seal
• Works on both small pinholes and larger gaps when applied generously

What surfaces and environments does it work on?

The formula bonds to common repair surfaces like metal, PVC, wood, fiberglass, and many plastics without special primers. It tolerates marine and outdoor conditions, resisting moisture while remaining flexible through temperature changes.

• Suitable for pipes, marine hulls, RV seals, and automotive panels
• Maintains adhesion on damp and underwater substrates
• Remains pliable for repositioning or removal when needed

How do you apply and remove Power Putty?

Simply knead the putty with your hands, press it into the damaged area, and smooth to form a tight bond — no tools or mixing required. Removal is equally straightforward: peel or pry the cured putty away when you’re ready to replace or reposition the repair.

• Hand-shape to fit cracks, holes, and odd shapes
• No drying time means immediate use under pressure or water
• Easily removable and reusable for temporary or test repairs

Will it hold up long-term or in structural repairs?

Power Putty is intended primarily for fast, effective sealing and temporary or semi-permanent repairs rather than as a structural adhesive. For long-term load-bearing fixes or where a permanent mechanical bond is required, use this product as an interim solution and consult permanent repair options if needed.

• Excellent as a waterproof, airtight stopgap measure
• Not designed to replace welds, bolts, or structural supports
• Combine with permanent repair techniques for long-term fixes

Who is this for: Flex Seal Power Putty is for homeowners, boat owners, RVers, mechanics, and DIYers who need a fast, hand-moldable waterproof seal for emergency leaks, temporary patches, or test repairs. It’s especially useful when working on wet or submerged surfaces and when a removable, repositionable option is preferred.