Profile: Nylok Corp. provides fastener coatings. We offer locknuts and other fastener sealing accessories. Our blue patch self-locking element is permanently spray bonded on the threads of a fastener. Our patented temporary retention coating holds fasteners in place during transport or assembly. We offer nyplas, a pre-applied coating under the heads of a variety of fasteners to provide sealing against water, moisture, dust, air and noise dampening.