Hylomar M as a gasket sealant?

[JHZR2]

I don’t know if I used it right. It’s hard to put and spread a bead. It stays soft but it tacks up quickly and it can’t be spread with a finger. Maybe I’m applying too thin?

I generally use it as a tracking agent to hold a dry gasket on a cover, like in the pics. I guess it makes up anomalies as well.

 

[Snagglefoot]

That will do!

 

[Trav]

I don’t know if I used it right. It’s hard to put and spread a bead. It stays soft but it tacks up quickly and it can’t be spread with a finger. Maybe I’m applying too thin?

I generally use it as a tracking agent to hold a dry gasket on a cover, like in the pics. I guess it makes up anomalies as well.

View attachment 27459View attachment 27460View attachment 27461

No problem as long as some is on all surfaces and from what I can see it is, that will never leak.

 

[SZR48207]

Aren't you supposed to dispense it along the perimeter, install it onto the part, then pull it off, then finally install it.

It'll make those cheesy pizza strings when you pull it off which helps to spread it around.

 

[JHZR2]

What I found was:


Instructions For Use:

The joint faces should be clean and dry. Both faces should then be coated with a thin even film of the product, and the solvent allowed to evaporate. The components can then be assembled. Since Hylomar M is non-setting, once applied to the faces of the component, immediate assembly is not required. Due to the nature of Hylomar M, re-torquing of assembled components may be required.

 

[Trav]

What I found was:


Instructions For Use:

The joint faces should be clean and dry. Both faces should then be coated with a thin even film of the product, and the solvent allowed to evaporate. The components can then be assembled. Since Hylomar M is non-setting, once applied to the faces of the component, immediate assembly is not required. Due to the nature of Hylomar M, re-torquing of assembled components may be required.

That is correct.

 

[SZR48207]

This must be the video I was thinking of.

 

[RadioMannnn]

I have seen used Indian Head Shellack High-Tack, if this is anything like that it should work wonderful.

Primarily for oil pans, sure, but I believe there are other and similar uses.

 

[ABN_CBT_ENGR]

If I may ( and your post didn't specify what flavor Hylomar)

I presume this is one of the ones made for Hylomar by Permatex (old #2 Permatex)?

You said sealant and I presume there is a gasket there but cant see clearly from your picture.

If so, this stuff only "seals" ( function as an asperity filler and then as a seal in place of a gasket) on "machined fits" with adequate mass to really hold tolerance and fit with no movement. ( many gear boxes require this for the housings for that reason rather than a gasket which may affect clearances)

On thin metal applications ( even with stiffeners) it doesn't work well except when sealing the halves to the gasket like a glue and should not be used to replace a gasket.

Just a friendly observation and comment if it applies

 

[JHZR2]

If I may ( and your post didn't specify what flavor Hylomar)

I presume this is one of the ones made for Hylomar by Permatex (old #2 Permatex)?

You said sealant and I presume there is a gasket there but cant see clearly from your picture.

If so, this stuff only "seals" ( function as an asperity filler and then as a seal in place of a gasket) on "machined fits" with adequate mass to really hold tolerance and fit with no movement. ( many gear boxes require this for the housings for that reason rather than a gasket which may affect clearances)

On thin metal applications ( even with stiffeners) it doesn't work well except when sealing the halves to the gasket like a glue and should not be used to replace a gasket.

Just a friendly observation and comment if it applies

Your detailed comments are always welcome

Title indicated Hylomar M. Yellow and blue tube with it by name, not Permatex.

Second picture shows the gasket on the timing cover case. Essentially I put Hylomar M on the case surface, then sat the gasket on it and smeared it around a bit, then put a thin coating of Hylomar M on the gasket surface. Pressed it in place on the cleaned timing gear case surface, and then lightly installed the bolts, then torqued to spec.

The "wait 10 minutes" aspect to let the solvent flash off seemed unnecessary. If a thick blob was installed, it was workable for a few seconds. If put in thin from the tube, any touch would make it "ball up"... I wonder if mine just does not have enough acetone. Its about a year old, but I got it on Ebay. I wonder if its NOS.

 

[ABN_CBT_ENGR]

Your detailed comments are always welcome

Title indicated Hylomar M. Yellow and blue tube with it by name, not Permatex.

Second picture shows the gasket on the timing cover case. Essentially I put Hylomar M on the case surface, then sat the gasket on it and smeared it around a bit, then put a thin coating of Hylomar M on the gasket surface. Pressed it in place on the cleaned timing gear case surface, and then lightly installed the bolts, then torqued to spec.

The "wait 10 minutes" aspect to let the solvent flash off seemed unnecessary. If a thick blob was installed, it was workable for a few seconds. If put in thin from the tube, any touch would make it "ball up"... I wonder if mine just does not have enough acetone. Its about a year old, but I got it on Ebay. I wonder if its NOS.

Next time I'll wait till I get in the office and actually look through a real screen and not in the field on the small one. I see the gasket clearly now.

Different note: I have been repeatedly told by my Permatex contacts that over time the solvents will separate and often settle in the tube and require warming and kneading before use or always order new (less than 6 months old). I have seen ( and experienced) what you are describing.

Its a big consideration/crisis for me in my world because many of my sites are extremely remote and many OCONUS in "harsh" areas where running to the store isn't an option so I always order fresh stock specified by date code for a job.