Flamemaster CS-415 Class B1-2 Aerodynamic Smoothing Compound (MIL-S-38228)

The Flamemaster CS-415 Class B1-2 is a two-part, synthetic non-metallic compound specifically engineered for critical aerodynamic smoothing and fairing applications on high-performance aircraft. This product is a designated Aerodynamic Smoothing Compound, providing a lightweight, high-strength filler essential for optimizing airflow, minimizing drag, and preparing surfaces for top-coat application. It is fully qualified to the stringent MIL-S-38228 military specification for this purpose. The Class B consistency is a thixotropic, non-sag paste that allows technicians to apply thick layers without slumping, ideal for filling deep gaps, voids, and contouring complex surfaces. 

Typical Aviation Applications:

The CS-415 Class B1-2 is indispensable in both manufacturing and MRO for achieving optimal aerodynamic performance:

• Structural Gap Filling: Filling panel overlaps, riveted joints, and voids in structural assemblies to ensure a monolithic, paintable surface.
  

• Fillet Contouring: Creating smooth, continuous transition fillets around structural components to minimize turbulence and drag.
  

• Radar/Antenna: Used in non-metallic areas, or where specified, to provide a structurally sound, sandable surface prior to radome coating.

• 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.