Nylok offers a variety of under head sealants for various fastener sealing applications. One recently developed new sealant (NySeal® 2.0) has very robust mechanical properties, coupled with superior adhesion to steel substrates, making it suitable for joints where reusability is essential. Nylok’s pre-applied under-head-sealants provide a leak proof barrier with available chemical resistance and increased reusability. Unlike traditional o-rings that can dry out or be easily compromised from nicks, cuts, abrasions, etc., these exceptionally durable and consistent coatings benefit from a strong adhesion to the fastener and are compatible with a variety of substrates including plastics (eliminates crazing). Also available in a low outgassing version.