As of June 23, 2021, we have fresh material and are shipping domestically and internationally.

Shop Products
Get Pricing


A global specialty chemicals and materials company focused on developing, manufacturing and selling value-added products.

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 of specification:  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): 24
  • Cure Time (hrs): <7
Shelf Life: 12 Months | Consistency: Paste | Color: 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.

Get Pricing

Technical Data Sheets (TDS)

Safety Data Sheet (SDS)

NSL Product Guides