Home > VansAirForceForums

- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

Old 12-13-2017, 12:31 PM
rapid_ascent rapid_ascent is offline
Join Date: Mar 2008
Location: Dublin, CA
Posts: 1,006
Default Thread Sealant Application Method

I have a basic question about the application of thread sealants. I'm using some loctite thread sealant on my NPT fittings. I don't recall the exact number at the moment. I apply a small bead of sealant all the way around the fitting about 2 threads up from the end of the fitting which I believe is the proper method. I've tried to not use too much sealant but yet form a complete bead all the way around the fitting. That part I think I'm doing correctly. I then thread the fitting into the mating fitting and a small bead of sealant forms on the external surface. My question has to do with this bead of sealant and the proper method to deal with it. I've been wiping off the bead of sealant once the fittings are fully mated. I figured I should check to see if this is an acceptable process to follow before I get the entire fluid system installed using the wrong method.
Ray Tonks
2018 Donation Paid
RV-7 Fuselage in progress
* Rolled the Fuselage
RV-7 SB Wings
* Both Wings fully skinned
* Fuel Tanks Complete - No leaks finally
* Ailerons Complete
* Flaps Complete
RV-7 Empennage - Complete (a little fiberglass work left)
Vans Training Kit # 2 - Complete
Shop Setup - In Progress (Gathering Tools, Never Complete)
RV-7 Preview Plans
Vans Training Kit #1 - Complete
EAA Sheet Metal Class - Complete
Reply With Quote
Old 12-13-2017, 03:53 PM
rightrudder rightrudder is offline
Join Date: Mar 2014
Location: Laguna Hills, CA
Posts: 1,711

You're doing it right. Doesn't take much, and the part about leaving the first two threads dry is really important.

I'm happy with leaving the bead of sealant in place, but it won't hurt to wipe it off. Typically, I use Loctite 567...since it sets up anaerobically, that external bead that's exposed to air always stays a little gooey.
RV-9A "slider"
Flew to Osh in 2017 & 2018!
Tail number N427DK
Donation made for 2019
You haven't seen a tree until you've seen its shadow from the sky -- Amelia Earhart
Reply With Quote
Old 12-13-2017, 07:16 PM
pilotkms pilotkms is offline
Join Date: Mar 2007
Posts: 301
Default More specifics

After having several leaky brake fittings and failed attempts at fixing them, i was shown what i believe is the proper way to apply thread sealant. Just using the tube and placing sealant around the threads didnt work for me. What was needed was using your finger and pushing it into the threads all the way around the fitting. Then clean any off on the first couple of threads. Doing This finally corrected my leaky fittings. Try it - Nothing to lose.
Robert Paisley of EFII demonstrated the procedure and Rightrudder, above, can attest to my troubles. 2 months and 30+ hours with NO leaks.
RV 7A RV #9700 May 2017
N325KS the Flying K
Built in SoCal KCCB, now in GA @ KPXE
350+ Hours & 7X cross the USA
2018 OSH - yes
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -6. The time now is 11:30 PM.

The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.