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Hylomar. Why hasn't it replaced gaskets? #4696228
03/15/18 11:38 PM
03/15/18 11:38 PM
Joined: Aug 2008
Posts: 3,473
Where the wind comes sweepin'
Reddy45 Online shocked OP
Reddy45  Online Shocked OP

Joined: Aug 2008
Posts: 3,473
Where the wind comes sweepin'
This was mentioned in the other thread about RTV, so I looked into it.

It has been around for a few decades and was invented for the aviation industry. Applies like RTV. Infinite working time and you can disassemble/reassemble many times without cleaning/reapplying it.

I haven't yet found any complaints of its performance.

Quick video showing its use:




Longer product video by the mfr:


Re: Hylomar. Why hasn't it replaced gaskets? [Re: Reddy45] #4696241
03/16/18 12:00 AM
03/16/18 12:00 AM
Joined: Jul 2003
Posts: 5,083
New Zealand
Silk Offline
Silk  Offline

Joined: Jul 2003
Posts: 5,083
New Zealand
I've been using Hylomar form decades. Back in the '70's when I was riding leaky British bikes, there was no silicone sealer...or Hylomar for those who didn't know where to get it. Made for Rolls Royce, we used to get it from the Foden dealer, because they used RR engines. Silicone sealers came to save the day, but I always have Hylomar on hand...still a tube in the shed.


1987 BMW R65 - Aegis SAE30
2005 Nissan Expert - 5W-40 Castrol Magnatec diesel.
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.
Re: Hylomar. Why hasn't it replaced gaskets? [Re: Reddy45] #4696273
03/16/18 02:08 AM
03/16/18 02:08 AM
Joined: Aug 2010
Posts: 12,915
Northern Kentucky
901Memphis Offline
901Memphis  Offline

Joined: Aug 2010
Posts: 12,915
Northern Kentucky
That's what I used on my water pump on my Buick and the radiator hose too. Trav recommended it, no leaks so far smile


2012 Chevy Cruze LT 1.4T - 59k - Edge 0w30 SL + Mahle OX401D
2002 Buick Century 144k - Built 4T65e(Maxlife) - GTX 5w30 + Fram XG3980
Re: Hylomar. Why hasn't it replaced gaskets? [Re: Reddy45] #4696461
03/16/18 08:52 AM
03/16/18 08:52 AM
Joined: Dec 2003
Posts: 823
New England, USA
wings&wheels Offline
wings&wheels  Offline

Joined: Dec 2003
Posts: 823
New England, USA
Great stuff in the right applications, especially good at stopping seeping on traditional cork gaskets. I also like it on threaded fittings that I have to occasionally dissemble. Make sure you get the original, someone had a license to make it here at one point. One warning; use sparingly. Unlike RTV, it doesn't harden so any significant squeeze out will detach and can block, say, a carb flange vacuum port.... Guess how I know that?


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'01 Porsche Boxster S (mostly Wife's...)
Piper Pa28-236


Re: Hylomar. Why hasn't it replaced gaskets? [Re: Reddy45] #4696856
03/16/18 03:59 PM
03/16/18 03:59 PM
Joined: Sep 2004
Posts: 8,014
Marshfield , MA
andyd Offline
andyd  Offline

Joined: Sep 2004
Posts: 8,014
Marshfield , MA
Permatex makes Aviation Forma- Gasket and I've been using it for ages. If the edges were smooth and the torqued applied right it works great. I used it gluing case halves together when rebuilding bug engine. They make a thinner version that is brushed on and used as gasket glue. It is used for the same uses as Hylomar. Permatex is widely available


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

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Thick oil is better grin2
Re: Hylomar. Why hasn't it replaced gaskets? [Re: Reddy45] #4696898
03/16/18 05:10 PM
03/16/18 05:10 PM
Joined: Jan 2004
Posts: 5,007
California
nthach Offline
nthach  Offline

Joined: Jan 2004
Posts: 5,007
California
Man, I could have used that when I resealed a Subaru oil pump during a timing belt change - while it calls for RTV, extreme caution needs to be exercised to avoid squeeze-out that can break free, plug an oil gallery or passage and ruin the motor. I used Loctite 518 instead.

I think the OEMs back then didn't want to test the FIPG waters out and Hylomar was probably too expensive for OEM production line usage.

Re: Hylomar. Why hasn't it replaced gaskets? [Re: nthach] #4696947
03/16/18 06:17 PM
03/16/18 06:17 PM
Joined: Nov 2006
Posts: 21,273
MA, Mittelfranken.de
Trav Offline
Trav  Offline

Joined: Nov 2006
Posts: 21,273
MA, Mittelfranken.de
You did right with the loctite, an anaerobic like 51813 is much preferred over RTV in that particular application.
Hylomar could also be used with no problems if there are any gouges in the aluminum parts as it unlike an anaerobic with very limited gap filling ability is good at filling gaps.

The downside is cost, its not cheap but unlike RTV where most of the tube goes in the bin after one use the Hylomar stays usable.
One of my favorite uses for it is on hose nipples, just a thin coat will seal the hose regardless if its air, coolant, oils, gasoline or diesel without hindering future removal, you still have to use the clamp though.

For coolant leaks on plastic coolant nipples when the temps drop to zero or below and you keep tightening the clamps to stop it Hylomar is the permanent fix. Spread a thin film on the plastic part, put the hose and clamp on then tighten firmly but not over tight and forget it.

RTV is useful for steel covers but where aluminum flanges and covers are used Hylomar is superior. Now I only buy the samllest tube of RTV and open it when I need it then toss it and get another. The rest of the time I use Hylomar.


ASE L1, Master. Deutsch Meisterbrief.
Re: Hylomar. Why hasn't it replaced gaskets? [Re: Reddy45] #4696958
03/16/18 06:28 PM
03/16/18 06:28 PM
Joined: Jun 2003
Posts: 34,088
ME
eljefino Offline
eljefino  Offline

Joined: Jun 2003
Posts: 34,088
ME
Anaerobic has its place on assembly lines where something has to cure in 15 minutes or less. It sticks well enough, too, but in the service world RTV is suitable if not excellent for those with more patience.

Re: Hylomar. Why hasn't it replaced gaskets? [Re: eljefino] #4696968
03/16/18 06:38 PM
03/16/18 06:38 PM
Joined: Nov 2006
Posts: 21,273
MA, Mittelfranken.de
Trav Offline
Trav  Offline

Joined: Nov 2006
Posts: 21,273
MA, Mittelfranken.de
Not true in every case especially the Subaru oil pump or heads that have a separate cam holder where additional thickness may be an issue. In that particular application an anaerobic is sometimes mandatory.


ASE L1, Master. Deutsch Meisterbrief.
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