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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: 3,149
USA
Reddy45 Offline OP
Reddy45  Offline OP
Joined: Aug 2008
Posts: 3,149
USA
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: 4,741
New Zealand
Silk Offline
Silk  Offline
Joined: Jul 2003
Posts: 4,741
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 - Penrite V Twin 20/50
2005 Nissan Expert - Gulf Western 10W-40
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: 12,903
Northern Kentucky
901Memphis Offline
901Memphis  Offline
Joined: Aug 2010
Posts: 12,903
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 - 50k
2002 Buick Century 130k - Built 4T65e(Maxlife) - Edge 0w40 + 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: 611
New England, USA
wings&wheels Offline
wings&wheels  Offline
Joined: Dec 2003
Posts: 611
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?


'05 Lotus Elise S/C
'85 Land Rover 90 diesel
'74 Triumph TR6
'72 Land Rover Series III 88"
'99 Porsche 996/'01 Boxster S (Wife's...)
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: 7,510
Marshfield , MA
andyd Online content
andyd  Online Content
Joined: Sep 2004
Posts: 7,510
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

'16 Camry SE, Valvoline HM 0w20 and OEM filter
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: 4,142
California
nthach Offline
nthach  Offline
Joined: Jan 2004
Posts: 4,142
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: 19,888
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 19,888
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: 33,070
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,070
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: 19,888
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 19,888
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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