Flamemaster CS-5306 B-1/2 Gray Polythioether Fast Cure Sealant - Rapid Repair Fuel Sealant for Aviation (Meets AMS 3277H Type I, Grade 1 / Formerly MIL-S-29574 Type I)

Ensure swift and reliable repairs to aircraft fuel systems with Flamemaster CS-5306 B-1/2 Gray Fast Cure Sealant. This high-performance, two-part polythioether sealant is specifically engineered for rapid sealing of integral fuel tanks and other critical areas. Its advanced formulation provides exceptional resistance to aviation fuels, lubricants, and the harsh environmental conditions encountered by aircraft. Meeting the stringent requirements of AMS 3277H Type I, Grade 1 (and notably, formerly MIL-S-29574 Type I), it offers superior adhesion to aluminum, magnesium, and titanium, along with excellent flexibility and durability. The "B-1/2" designation signifies its 30-minute application life, making it ideal for time-sensitive flight line repairs. This gray, thixotropic sealant cures to a flexible, resilient rubber, providing a robust and long-lasting seal, even on vertical and overhead surfaces.

Key Features for Aviation:

• Specifically designed for fast-cure and rapid repair of aircraft fuel tanks and components.
  
• Meets the requirements of Aerospace Material Specification AMS 3277H Type I, Grade 1, a critical industry standard for advanced fuel tank sealants.
  
• Formerly qualified under U.S. Military Specification MIL-S-29574 Type I, confirming its proven military-grade performance and reliability.
  
• Polythioether base provides superior resistance to aviation fuels (Jet A, JP-8, Avgas), hydraulic fluids, and other aggressive aerospace chemicals.
  
• Offers excellent adhesion to common aircraft substrates, including aluminum, magnesium, and titanium.
  
• 30-minute application life (B-1/2) allows for quick and efficient sealing, minimizing aircraft downtime.
  
• Thixotropic (non-flow) properties enable application on vertical and overhead surfaces.
  
• Cures to a flexible, resilient rubber that maintains a strong seal across a wide temperature range.
  
• Gray color provides a visual indicator of sealant application.

Typical Aviation Applications:

• Expedited repair of leaks in integral fuel tanks and fuel cells.
  
• Rapid sealing of fasteners, fillet seals, and access panels on the flight line.
  
• Overcoating of fasteners and seams in fuel-contacting zones.
  
• Use in urgent maintenance, repair, and overhaul (MRO) scenarios for commercial and military aircraft where quick turnaround is essential.

• All in-stock orders are processed within 1–2 business days (excluding weekends and holidays) after receiving your order confirmation email.
• Orders with a lead time will ship according to the estimated shipping time shown on the product page.
• If we experience a high volume of orders or if an item is backordered, processing times may be slightly delayed. We will notify you promptly via email.

• Returns must be made within a maximum of 3 business days after receiving the product, with prior authorization from Aircraft Shop Supply (Return Material Authorization). Returns without prior notice or written authorization will not be accepted.
• For products with 3 to 6 months of remaining shelf life, claims must be made within the next 2 business days after receipt.
• Returns are not accepted for products with less than 3 months of remaining shelf life.
• Returns are not accepted for products purchased during a low Shelf Life promotion, items sold with discounts, or special orders that must be placed directly with the factory.
• The customer is responsible for the return shipping cost, except in cases where the return is due to an error on the part of Aircraft Shop Supply.
• Refunds will only be issued after the product has been inspected and no damage is found.
• A 25% Restocking Fee will be charged for returns of products in good condition that are either no longer needed or were ordered incorrectly.
• A 35% Restocking Fee will be charged for returns of products with one year or less of remaining shelf life.
• No Restocking Fee will be charged if Aircraft Shop Supply is responsible for incorrectly shipping a product, or if the order is damaged upon leaving the warehouse.
• Hazardous Materials & Dangerous Goods: These items are sold as final and are not eligible for return approval.