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?

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F/HMMS00C/040G 40g Universal Blue

Product ID: 49103151

🔄Non-setting, reusable

🔥High-temp resistant

🛢️Oil & fuel proof

3007 som

Duties & taxes included

In stock

Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Seal like a pro, leak like never before!

TRUSTED LEGACY - Backed by 30+ years of engineering excellence and Rolls Royce-approved quality assurance.
NON SETTING FORMULA - Never hardens, allowing unlimited assembly and disassembly without losing sealing power.
VERSATILE APPLICATION - Perfect for metal-to-metal, plastic-to-plastic, and gasket sealing across automotive and industrial uses.
ULTIMATE FLUID RESISTANCE - Repels oils, fuels, lubricants, and water to prevent leaks and maintain performance.
UNMATCHED TEMPERATURE RESILIENCE - Withstands extreme heat without breaking down, keeping your seals intact under pressure.

Hylomar Universal Blue is a premium 40g non-setting jointing compound designed for high-temperature and fluid-resistant sealing. Ideal for automotive and industrial joints, it offers a flexible, reusable seal that withstands oils, fuels, and lubricants. Trusted by manufacturers for over 30 years, including Rolls Royce, it ensures leak-free performance and easy maintenance.

Specifications

ASIN	B0064M6A6G
Best Sellers Rank	8,506 in Automotive ( See Top 100 in Automotive ) 107 in Fillers, Adhesives & Sealants
Brand	Hylomar
Customer Reviews	4.7 4.7 out of 5 stars (315)
Date First Available	30 Mar. 2011
Item Weight	59 g
Item model number	F/HMMS00C/040G
Manufacturer	Hylomar Ltd.
Manufacturer part number	HB40G
Model	F/HMMS00C/040G
Package Dimensions	18.29 x 5.41 x 4.8 cm; 59 g

Reviews

S**S

Gasket glue

Excellent product

15.04.2026

M**S

works well

Excellent quality sealant

17.01.2026

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

D**N

Thumbs up from me

Works as advertised

1.06.2026

P**S

18.06.2025

A**Y

No more leaks

Great non setting gasket sealer always used this never any leaks

2.12.2025

M**D

Value

5.05.2026

R**L

Quality and value

Excellent quality and value

12.02.2026

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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