Gasket Sealant…. the whys and wherefores. We have answered this question many times at RAM and as often happens, there is no straight answer. There are many different applications and requirements and 1000’s of gasket sealants available.
Most of our gaskets do not require sealant. If a solid gasket is being newly fitted to new products/flanges sealant is not necessary. We most commonly supply some of our gaskets with adhesive backing – to allow for perfect placement and no slippage when fitting, the adhesive backing is stable and only adheres where you want it, it won’t extrude or leak into places it shouldn’t.
Be aware that the main issue with gasket sealant is that it is often not necessary as an addition to a solid gasket and can make replacement of solid gaskets/old sealant much harder Another example is using sealant on delicate flanges such as aluminium, it can be a nightmare to remove leaving an even more pitted and dented surface.
We would recommend gasket sealants alongside our solid gaskets only when necessary, if a flange is very uneven and it could help to fill any gaps and when leakage of the sealant would not be an issue. There are many types of gasket sealant available, just the same as gasket materials, each for different applications. A general rule, if you are using gasket sealant, you don’t need a lot! A tiny amount skimmed over a surface to fill any slight indents is all that is required for most applications.
Automotive applications commonly use gasket sealant alongside solid gaskets, as they are repairing older parts. Gasket sealant can be used to make cheaper gasket materials more robust, increasing adhesion and chemical/water resistance.
RTV sealants are Room Temperature Vulcanising and needs to be at room temperature to cure. There are non-setting compounds, anaerobic sealants which does not set hard and maintains a consistent seal.
There are liquid gaskets used to create a seal. These have many benefits and are used solely as a liquid, not alongside a solid gasket. RAM does not supply liquid gasket materials.
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Second gear
Join Date: Aug 2012
Location: United Kingdom
Posts: 149
New head gasket... should I use a sealant or dry seal?
Hi there,
I am replacing my 1.8 1997 head for a ported equivalent. I will of course also be changing the head gasket while im in there.
My question is, should i coat the new head gasket in gasket sealant before assembly?
(The machine shop where I had the head skimmed advised that for MLS gaskets they use a product called Stag Wellseal (which I have purchased))
However after doing some googling, lots of people advise strongly against using any kind of sealant, saying that allowing the gasket to dry seal is much better...
Neither heads, nor block are warped, old head gasket has not blown
Also if I am to apply gasket sealant, should I apply to just one side or both sides?
Also also, is there a particular best practice for sealant application? I dont want to apply it and then when the head is torqued down for it all to splurge into my oil and coolant passages...
Any advise would be awesome! Thank you!
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Simplicity is the ultimate sophistication.
1997 NA 1.8 Naturally Aspirated BRG
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