This is how thread sealant is used:
![](/community/proxy.php?image=http%3A%2F%2Fi1368.photobucket.com%2Falbums%2Fag200%2FDan51%2FMisc%2520VAF%2520Illustrations%2FNPT%2520Sealing_zpsttkawkvw.jpg&hash=907e50fd1900886689773d98d66ef4b4)
The listed sealants are suggestions with long service histories. You'll also find the brands suggested in the Vans builders manual. The actual choice is the builder's responsibility.
They are non-hardening sealants, meaning they don't tend to form solid chunks. A good sealant is easy to clean from female threads, which must be sealant-free each time a male fitting is inserted. Failure to clean the female threads can allow the male to push cured or uncured sealant further into the fitting, which may form a blockage.
The point is to avoid something like you see below, in which a poor sealant choice was sheared loose into the fitting, resulted in loss of fuel flow.
![](/community/proxy.php?image=http%3A%2F%2Fi1368.photobucket.com%2Falbums%2Fag200%2FDan51%2FMisc%2520VAF%2520Illustrations%2FStupid_zpshqk3ppzz.jpg&hash=0956557e01a414d5f97f20f76fa46bdb)
![](/community/proxy.php?image=http%3A%2F%2Fi1368.photobucket.com%2Falbums%2Fag200%2FDan51%2FMisc%2520VAF%2520Illustrations%2FNPT%2520Sealing_zpsttkawkvw.jpg&hash=907e50fd1900886689773d98d66ef4b4)
The listed sealants are suggestions with long service histories. You'll also find the brands suggested in the Vans builders manual. The actual choice is the builder's responsibility.
They are non-hardening sealants, meaning they don't tend to form solid chunks. A good sealant is easy to clean from female threads, which must be sealant-free each time a male fitting is inserted. Failure to clean the female threads can allow the male to push cured or uncured sealant further into the fitting, which may form a blockage.
The point is to avoid something like you see below, in which a poor sealant choice was sheared loose into the fitting, resulted in loss of fuel flow.
![](/community/proxy.php?image=http%3A%2F%2Fi1368.photobucket.com%2Falbums%2Fag200%2FDan51%2FMisc%2520VAF%2520Illustrations%2FStupid_zpshqk3ppzz.jpg&hash=0956557e01a414d5f97f20f76fa46bdb)
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