Is this suitable for use in petrol fuel tanks? does it stay soft or go hard after sometime? Cheers

Hylomar is primarily a sealant for joints and gaskets and is a non hardening compound and although resistant to oil and fuel I would not actually recommend putting it inside a fuel tank. Hope this helps

Is this suitable for sealing the rubber gasket (fitted in the plastic fuel tank through which the fuel line passes from the tank to carb of a chainsaw

I do not see why not; i used it for a very similar job, the fuel tank sender unit on my RIB still working fine with no problem. All mating faces spread a thin film across.

Hi, can anyone please tell me whether this will seal between a metal sealing plate and a plastic petrol tank on a car? Many thanks

i would not recomend you doing that as it is highly inflamable, john.

Can this be used on the gasket of a kettle for a boiling water tap?

Yes developed by rolls Royce I always use it on my bike engine cases which are well above this temp. Note a screwed tight gasket on a tap shouldn’t need it really 😁

1 X Hylomar Universal Blue 100g Tube Fuel Resistant Jointing

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

Help Track order

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Description

🔧 Seal it like a pro—no leaks, no worries!

TRUSTED BY PROS - 4.6-star rating from 400+ users proves reliability in real-world repairs
VERSATILE SEALANT - Perfect for fuel pumps, water pumps, and engine joints—one product, multiple fixes
PRECISION 100 G TUBE - Compact size for controlled, mess-free application every time
FUEL RESISTANT FORMULA - Engineered to withstand petrol exposure without degradation
LONG LASTING FLEXIBILITY - Remains pliable, never hardens or cracks, ensuring durable seals under stress

HYLOMAR Universal Blue is a 100g fuel-resistant jointing gasket sealant designed for professional-grade sealing on fuel and water-exposed engine parts. Its flexible, non-hardening formula ensures durable, leak-proof joints, trusted by mechanics and DIY enthusiasts alike for over a decade.

Specifications

ASIN	B00BMMWAVC
Batteries Required?	No
Best Sellers Rank	82,081 in DIY & Tools ( See Top 100 in DIY & Tools ) 1,035 in Sealers
Customer Reviews	4.6 4.6 out of 5 stars (443)
Date First Available	28 Feb. 2013
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 Package Quantity	1
Item Weight	120 g
Manufacturer	All Trade Direct
Manufacturer reference	9408989
Package Dimensions	16.5 x 4.2 x 3.7 cm; 120 g
Part Number	9408989

Reviews

G**G

Lomas.

Used this stuff for years, never let me down.

20.06.2026

S**E

Excellent product.

Good product and easy to use .

12.10.2026

A**S

Old dependable!

Does what it says on the tube...

9.11.2025

B**D

Handy for your toolkit

A useful multi purpose sealant I always keep to hand in the workshop and toolbox. Easy to use, just be careful to not let it enter or block oil or coolant galleries.

15.05.2026

S**N

Hylomar blue

Used this about 20 years ago in college (apprentice mechanic) and forgot about it , my motor bike fuel tank was leaking petrol at the seal, a mate suggested hylomar which the penny dropped , he’d the same Problem, so used some of this on the immersed fuel pump seal, no more Leaks , 💯 on this ! Gets you outa jail , also used this on engine water pump , water And petrol resistant , it comes across kinda sticky when using this , doesn’t solidify

29.06.2024

R**B

Great stuff

Arrived on time have used this product for years works very well

16.11.2025

P**N

Great sealant

Excellent service and a great sealant

1.09.2025

B**S

Works well

Used once and works well so far

16.07.2025

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¥5217

Duties & taxes included

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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TrustScore 4.5 | 7,300+ reviews

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1 X HYLOMAR UNIVERSAL BLUE 100G TUBE FUEL RESISTANT JOINTING GASKET SEALANT by All Trade Direct

Description

Specifications

Reviews

Common Questions