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 | Desertcart South Africa

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Description

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

TRUSTED LEGACY - Backed by 30+ years of Rolls Royce-approved engineering excellence.
PRECISION 40 G TUBE - Compact yet powerful size for professional-grade repairs and maintenance.
ENDLESS REUSABILITY - Non-setting formula means no hardening—disassemble and reassemble without hassle.
ULTIMATE FLUID RESISTANCE - Repels oils, fuels, lubricants, and water for leak-proof performance.
UNMATCHED TEMPERATURE RESILIENCE - Withstands extreme heat to keep your joints sealed under pressure.

Hylomar Universal Blue is a 40g non-setting jointing compound designed for superior sealing of metal and plastic joints. Resistant to high temperatures, oils, fuels, and lubricants, it offers unlimited assembly and disassembly without hardening. Trusted by automotive professionals worldwide and developed with Rolls Royce expertise, it ensures reliable, leak-proof performance in demanding environments.

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

User

Excellent Product

Hylomar has always worked faultlessly for me

2.09.2026

User

Gasket glue

Excellent product

15.04.2026

User

Thumbs up from me

Works as advertised

1.06.2026

User

Quality and value

Excellent quality and value

12.02.2026

User

Ok with modern petrol

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

30.03.2025

User

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

User

No more leaks

Great non setting gasket sealer always used this never any leaks

2.12.2025

User

works well

Excellent quality sealant

17.01.2026

Common Questions

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Khalid Z.

Great experience from order to delivery. Highly recommended!

1 week ago

Ayesha M.

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

5 days ago

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R51

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In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

Abdullah B.

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

3 weeks ago

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F/HMMS00C/040G 40g Universal Blue

Description

Specifications

Reviews

Common Questions