View Full Version : gasket "goop"

06-19-2008, 01:46 PM
I am interested in what the forum recomends in terms of a "goop" to add to gaskets on the engine. I am not talking about the head gasket but rather for things like the fuel pump to block, tranny parts when rebuilding a tranny, timing chain covers and things like that. Mostly things with paper or thin cork gaskets.

It would be nice if there was a product that I could keep in the tool chest that has a long shelf life so it is there all the time.


06-19-2008, 02:59 PM
I usually stick with the appropriate Permatex product (i.e. rated for gas, coolant, etc.) Recently did my valve cover gasket, and previously the rear axle gaskets on my 1500.

06-19-2008, 03:52 PM
In non-gasoline areas, I like The Right Stuff from Permatex.
In many areas you can eliminate the paper gasket as they tend to be a weak spot.

06-19-2008, 04:42 PM
What would you use on a new oil pan gasket?

06-19-2008, 05:14 PM
My preference is for Hylomar. Unlike others, it really does remain soft and pliable forever. Easy to remove too, generally you just peel the gasket away and wipe the surface with solvent. Frequently the gasket can even be reused (if it wasn't overtorqued). And it does keep for a long time, even in an open tube. I'm using the last little bit of a tube I first opened maybe 4 years ago. Works great on pan gaskets, axle gaskets, etc.

Also, unlike the silicone RTV products, it never forms 'strings' of material that can break off inside and clog critical passages. (Took my grocery hauler to the shop last fall because the heater didn't work ... previous shop had used RTV on the water pump and the strings clogged up the heater.)

In a pinch, you can use Hylomar as gasket replacement if the surfaces fit accurately. But I prefer to use it as a gasket dressing.

BTW, HF really does have Hylomar for $5/tube. I just bought a bunch at my local store.

06-19-2008, 05:57 PM
Unavailable here locally. Thanks,for the tip, Randall. I placed an order for couple of tubes.

06-19-2008, 06:01 PM
I also use Permatex. Their website has a product selection guide ( https://www.permatex.com/resource_auto_prodselect.htm ) that's helpful in choosing the right product.

Plus it's available from Crappy Tire :smile:

Hey - three posters from Ottawa in one thread!


Don Elliott
06-19-2008, 06:26 PM
I have always used the Permatex Aviation #3, a dark brown goop.

That make 4 Canucks here on this question.

Geo Hahn
06-19-2008, 07:41 PM
I, too, prefer the Hylomar. Mainly because I figure someday I will be back this way again and it not only makes a nice seal but allows easy disassembly.

Used to be available from Permatex (under a licensing agreement) but now only available as the original 'made in the UK' flavor. As noted, from Harbor Freight or (slightly more $) from Moss.

06-20-2008, 04:03 AM
I have always used the Permatex Aviation #3, a dark brown goop.

That make 4 Canucks here on this question.

Ditto on the Permatex Aviation. The secret to using it is apply a fairly liberal coat to both surfaces and allow it to tack, wait at least half an hour, then stick it. I use it on every gasket that requires a sealant. Hylomar and me just don't get along.

06-20-2008, 04:47 AM
one of the previous owners used silicon on the oil pan gasket and when I pulled the pan off to replace the thrust bearing I found chunks of silicon in the oil pump strainer, so I would not use silicon on the oil pan gasket


06-20-2008, 06:26 AM
I have always had good luck with Permatex High Tack Spray-A-Gasket Sealant. This is a translucent red adhesive. You spray both sides of the gasket, let it tack, and apply the gasket. For valve covers I apply it to the top of the gasket and attach it to the valve cover and than apply a smear of Mobile 1 synthetic grease to the gasket that contacts the head.

I install seals with red Loctite.

Head gaskets are sprayed with Copper Coat and allowed to tack.

Teflon paste sealant for pipe threads.

Hylomar is good to fill larger gaps.


06-20-2008, 10:04 AM
I'm another Hylomar fan.