Flamemaster CS5306B1/4 Polythioether Quick Repair Fuel Sealant - Rapid Cure Fuel Sealant for Aviation (Meets AMS 3277 Type I / Formerly MIL-S-29574 Type I)

Minimize aircraft downtime and ensure critical fuel system integrity with Flamemaster CS5306B1/4 Polythioether Quick Repair Fuel Sealant. This high-performance, two-part polythioether sealant is specifically engineered for rapid repairs on integral fuel tanks and other areas requiring exceptional resistance to aviation fuels, lubricants, and demanding environmental conditions. Meeting the stringent requirements of AMS 3277 Type I (and formerly MIL-S-29574 Type I), it offers superior adhesion, flexibility, and durability with an accelerated cure rate. The "B1/4" designation typically refers to its application life, signifying a very fast working time, ideal for urgent flight line repairs. This sealant cures to a flexible, resilient rubber, providing a dependable, long-lasting seal.

Key Features for Aviation:

• Specifically designed for quick repair of aircraft fuel tanks and related components.
  
• Meets the requirements of Aerospace Material Specification AMS 3277 Type I, a critical industry standard for fast-curing fuel tank sealants.
  
• Formerly qualified under U.S. Military Specification MIL-S-29574 Type I, confirming its proven military-grade performance.
  
• Polythioether base offers superior resistance to aviation fuels (Jet A, JP-8, Avgas), lubricants, hydraulic fluids, and other aggressive chemicals common in aircraft environments.
  
• Provides excellent adhesion to aluminum, composites, and other common aircraft substrates.
  
• Very rapid cure time (as indicated by B1/4 application life) significantly reduces maintenance and repair turnaround.
  
• Maintains flexibility over a wide range of temperatures, ensuring a stable seal under diverse operational conditions.
  
• Two-part system ensures proper mixing and optimal curing.

Typical Aviation Applications:

• Expedited repair of leaks in integral fuel tanks and fuel cells.
  
• Quick sealing of fasteners and fillet seals on the flight line.
  
• Overcoating of fasteners in fuel system areas.
  
• Sealing small seams and joints in fuel-contacting zones where rapid cure is essential.
  
• Use in urgent maintenance and repair scenarios for commercial and military aircraft.

• 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.