4UAD SmartAirsoft High Viscosity Airtight Sealant Pen

The secret to a consistent build is a perfect air seal. This 4UAD formula is engineered to outperform standard lubricants by creating a long-lasting, airtight barrier on your internals. Whether you are sealing an AEG cylinder head or reviving dry O-rings, this viscous sealant ensures zero air loss, leading to more consistent muzzle velocity and significantly better gas efficiency.

The 4UAD sealant pen takes the mess out of maintenance. Instead of using a toothpick and a tub of grease, the fine-tip applicator lets you put sealant exactly where it is needed; it is perfect for reaching GBB magazine valves, nozzle seals, and piston heads. The formula is 100% silicone-safe, so it will not rot your O-rings or damage plastic internals. It is a clean, efficient way to keep your seals from drying out during long storage periods.

Each package comes with one 4UAD sealant pen, which holds enough formula for dozens of applications. To keep the applicator fresh, just make sure to snap the cap back on as soon as you are finished. It is a simple addition to your kit that helps you avoid frustrating gas leaks and keep your rifle’s FPS steady all day long.

Features:

• Leak prevention and repair for O-rings and gaskets

• Non-corrosive to plastic and rubber components
• Gap-penetrating high-viscosity formula
• Silicone-based life extension for rubber seals
• High-adhesion sealant for maximum integrity
• Portable twist-pen for touch-free application