Is this product suitable fur use with cylinder head gaskets/

No. you shouldn't use this on cylinder head gaskets. As another answer says it's fine for sealing joints where there is oil and water. There should be no need for this product on cylinder heads.

Is this suitable to use for sealing oil sumps where a gasket is not used?

Yes, as per other questions. It's fairly rare that a sump won't have a gasket - it may be useful to double check on that, if there are any online resources available on the engine in question. You could also look at making your own - from gasket paper. Still use Hyl/similar, but that might be my preferred option unless specific manual informs otherwise

Would this be suitable for a taper thread union on a petrol line?

My opinion is that it should work but a taper thread may seal better with PTFE tape, (Plumbers tape)

can it be used to seal outlet on woodburner

Hylomar Universal Blue has an operating range of -60 to +600 degrees farenheit. If your woodburner's outlet is less than 600f, then you can probably use it. If it's just below 600f, I'd think twice about using it, as it may start to give off toxic fumes. Why don't you use the proper stuff, ie fire putty/cement?

F Hmms00c 040g 40g Universal Blue

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MOP$176

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Sold byAmazon MacauDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Seal it once, trust it forever – the pro’s choice for leak-proof joints!

COMPACT POWER TUBE - 40g tube fits perfectly in your toolkit for on-the-go fixes
TRUSTED BY EXPERTS - Rolls Royce approved quality with 30+ years of industry leadership
ULTIMATE LEAK DEFENSE - Seals metal & plastic joints flawlessly for zero leaks
ENDLESS ASSEMBLY FREEDOM - Never hardens, allowing unlimited disassembly & reassembly
VERSATILE FLUID RESISTANCE - Withstands fuels, oils, water & lubricants without fail

Hylomar Universal Blue is a premium 40g non-setting jointing compound designed for automotive and industrial use. It provides a reliable, flexible seal across a broad temperature range and resists a variety of fluids including fuels and oils. Approved by Rolls Royce and backed by over 30 years of expertise, it ensures durable, leak-free joints that can be repeatedly assembled and disassembled without losing effectiveness.

Reviews

S**S

Gasket glue

Excellent product

15.04.2026

M**S

works well

Excellent quality sealant

17.01.2026

D**N

Thumbs up from me

Works as advertised

1.06.2026

A**Y

No more leaks

Great non setting gasket sealer always used this never any leaks

2.12.2025

P**S

18.06.2025

M**D

Value

5.05.2026

R**L

Quality and value

Excellent quality and value

12.02.2026

M**D

Great gasket sealer

Worked perfectly on rocker cover gasket. Just the job

1.07.2025

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