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Dapco 18-4F

Dapco 18-4F: Firewall Sealant

Dapco 18-4F from D Aircraft is a two-component, firewall sealant intended for use as a coating, sealant or filleting material in the construction, repair and maintenance of aircraft and is especially useful where fire resistance, exposure to phosphate ester fluids, and/or exposure to extreme temperatures -65°F (-54°C) to 400°F (204°C) are major considerations.

The sealant adheres well to a variety of substrates when primed with Dapco 1-100. Learn more below or get a quote today.


Meets Requirements: BMS 5-63 TY 1 B4

Packaging: Available in pints, quarts and gallons.

Technical Data

Cure Profile:
Application Life (hrs):4
Tack Free Time (hrs):-
Cure Time (hrs):24

Shelf Life: 12 monthsConsistency: PasteColor: Dark green

*Please consult the technical data sheet for specificities of environmental conditions that yielded the above data. Standard cure rates are based on industry curing standards. 


Why don’t we have pricing on our product page? Because pricing is not a one-size-fits-all proposition. There are multiple variables determining product price, such as:

  • Part name, type, class, or manufacturer
  • Size
  • Quantity
  • Specification
  • Shelf life requirement
  • Purchaser type: Distributor or end-user?

Every quote is custom, created just for you and your specific needs. Please fill out the form on our CONTACT US page and we’ll be in touch ASAP.

Bulk In Stock

Product Resources

Technical Data Sheets (TDS)

Safety Data Sheets (SDS)

NSL Product Guides