As of April 4, 2020, we have fresh material and are shipping domestically and internationally.


FAA approved replacements for PRC/PPG Aerospace Sealants.

NSL1428 Class B

NSL1428: Access Door Sealant

NSL1428 is an 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 part number for FAA links:

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: Class B*
  • 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.
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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

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