This high quality sealant is deceptively good. It is easily applied as a sort of thin gel but if you take the joint apart later for any reason you'll find that it has settled to a more even form which is semi hardened. It's also changed colour to a grey from blue! This provides an excellent seal surprising in view of how malleable the stuff is when it's being applied.
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Blue Hylomar is ethanol resistant, unlike RTV & silicone based engine sealants. Blue Hylomar is the only safe sealant to use on 2 stroke engine rebuilds and will prevent the inevitable curse of ethanol engine crank bay sealant wash away, that now plagues all 2 stroke engines since some idiot decided to contaminate petrol with ethanol. If your classic 2 stroke motorcycle engine suddenly starts ingesting and burning its own gearbox oil, then you'll need to split the crank cases and reseal them with Blue Hylomar. I've had 5 of my 2 strokes suffer from ethanol wash away, one twice after resealing it with my usual sealant that I'd been using for the past four decades. It took ethanol contaminated petrol less than 50 miles to wash it away around the crank bay, after being freshly resealed. After 5 year of being sealed with Blue Hylomar, no problems with it. Read full review
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Big tube, difficult leak to cure on my car ( sump ) fixed . oil tight no leak
Verified purchase: Yes | Condition: New
I first used this back in the early 70’s. It was developed by Rolls Royce, and was mega expensive. It would be around £80 for one tube at today’s comparative rate. It is simply the best
Verified purchase: Yes | Condition: New
I bough my first Tube of Hylomar blue in i965, for the Head Gasket for a Hillman imp i have used it ever since on all my projects I have tried other products none come even close to HYLOMAR BLUE !Regard's ray
Verified purchase: Yes | Condition: New
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