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.Customs & duties included in the price

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R51

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

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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	969 in Automotive ( See Top 100 in Automotive ) 9 in Fillers, Adhesives & Sealants
Brand	Hylomar
Customer Reviews	4.7 4.7 out of 5 stars (328)
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 Weight	50 g
Item model number	F/HMMS00C/040G
Manufacturer	Hylomar Ltd.
Manufacturer part number	HB40G
Model	F/HMMS00C/040G
Package Dimensions	13 x 3.2 x 2.7 cm; 50 g

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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.

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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.

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R51

Duties & taxes included

In stock

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

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Hylomar F/HMMS00C/040G 40g Universal Blue

Description

Specifications

Common Questions