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?

Hylomar F Hmms00c 040g 40g Universal Blue

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Description

🔧 Seal like a pro, leak like a no-show!

COMPACT 40 G TUBE - Portable and easy to apply, ideal for professional mechanics and DIY enthusiasts alike.
NON SETTING FORMULA - Never hardens, allowing unlimited assembly and disassembly—perfect for ongoing maintenance.
ULTIMATE FLUID RESISTANCE - Repels oils, fuels, lubricants, and water to maintain a leak-proof joint in any environment.
TRUSTED BY INDUSTRY LEADERS - Developed alongside Rolls Royce, ensuring premium quality and reliability for your vehicle.
UNMATCHED TEMPERATURE RESILIENCE - Withstands extreme heat without breaking down, keeping your engine sealed under pressure.

Hylomar Universal Blue is a premium 40g non-setting jointing compound designed for automotive and industrial use. Resistant to high temperatures and a wide range of fluids including oils, fuels, and lubricants, it provides a durable, flexible seal that never hardens. Trusted by manufacturers like Rolls Royce, it ensures reliable, leak-free joints with unlimited reusability for maintenance and repairs.

Specifications

Asin	B0064M6A6G
Best Sellers Rank	1,611 in Automotive (See Top 100 in Automotive) 24 in Fillers, Adhesives & Sealants
Brand	Hylomar
Customer Reviews	4.7 4.7 out of 5 stars (324) 4.7 out of 5 stars
Date First Available	30 Mar. 2011
Delivery Information	We cannot deliver certain products outside mainland UK ( Details). We will only be able to confirm if this product can be delivered to your chosen address when you enter your delivery address at checkout.
Guaranteed Software Updates Until	unknown
Item Model Number	F/HMMS00C/040G
Item Weight	60 g
Manufacturer	Hylomar Ltd.
Manufacturer Part Number	HB40G
Model	F/HMMS00C/040G
Package Dimensions	21.2 x 5.7 x 4.3 cm; 60 g

Reviews

J**W

Excellent Product

Hylomar has always worked faultlessly for me

2.09.2026

S**S

Gasket glue

Excellent product

15.04.2026

D**N

Thumbs up from me

Works as advertised

1.06.2026

R**L

Quality and value

Excellent quality and value

12.02.2026

S**S

Ok with modern petrol

Was ok from what I saw seams to work with modern petrol

30.03.2025

A**R

Easy to use straight from the tube

Arrived on time and used already. Easy to apply straight from the tube and not a bad price in my opinion.

12.07.2026

A**Y

No more leaks

Great non setting gasket sealer always used this never any leaks

2.12.2025

M**S

works well

Excellent quality sealant

17.01.2026

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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€ 17.73

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

Fatima A.

Best international shipping I've ever tried. Worth every penny!

3 days ago

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Hylomar F/HMMS00C/040G 40g Universal Blue

Description

Specifications

Reviews

Common Questions