As of September 24, 2020, we have fresh material and are shipping domestically and internationally.


FAA approved replacements for PRC/PPG Aerospace Sealants.

NSL1428 Class B

NSL1428: Aviation Access Door Sealant

NSL1428 is an aviation access door sealant intended for use on integral fuel tanks and pressurized cabins.  It is used as a strippable fillet and as a gasket of removable parts, designed to access areas where easy separation of joint surfaces is required. This product is an FAA approved PMA replacement for PPG’s PR-1428. Learn more below or get a quote today.

Replacement For: PR-1428 Class B
Conforms To: AMS3277, BMS5-37E & MIL-S-8784 by FAA-PMA Approval

Eligible manufacturers for NSL1428 series per FAA PMA Supplement PQ4210CE* include:
Boeing, Bombardier, Cessna, Dassault Aviation, Embraer, Rolls Royce

Click the part number to access the FAA PMA supplement:
NSL1428B1/2NSL1428B1/2 cont.NSL1428B2NSL1428B2 cont.

Packaging: Available in 2½ - and 6-oz. cartridges, pint, quart and gallon kits. Also available in premixed and frozen cartridges. Other-size packaging available upon request.

Technical Data:  *
  • Cure Profile: B-½ B-2
  • Application Life (hrs): ½2
  • Tack Free Time (hrs): <6<24
  • Cure Time (hrs): <10<24
Shelf Life: 9 months | Consistency: Paste | Color: Red

*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.

Request a quote

NSL PMA Sealants

  • Non-critical Part (FAA AC 43-18 (2))
  • FAA Approved (Supplement PQ4210CE)
  • 8130 Airworthiness Approval
  • PPG/PRC replacement
  • 30%-50% cost savings on average
  • Faster turnaround
  • Customizable packaging
  • Available pre-mixed and frozen (PMF)

Technical Data Sheets (TDS)

Safety Data Sheet (SDS)

NSL Product Guides