Petrol proof adhesive

[AJWParticipant @ajw]

Made a start on my new Edgar T Westbury’s Centaur engine project. Started with the base, an aluminium casting with a large cavity underneath. As well as supporting the engine it acts as a fuel tank, the base of which it is suggested to bond in an alloy blanking panel.
All well and good I thought so have been cleaning up the casting and have prepared a piece of 1/8 in ally sheet ready to fill the base.
I was going to use Araldite to fix it in but am not sure about it liking being in full time contact with petrol or use something else?

Alan

[AJWParticipant @ajw]

[John RuddParticipant @johnrudd16576]

There used to be a product calledd "Petropatch" for car petrol tank repairs… May be suitable if still available marketed by Grenville iirc..

[JasonBModerator @jasonb]

I've stuck several similar model fuel tank covers with JBWeld Original (red & black tubes) and have not seen any signs of it degrading.

Edited By JasonB on 08/09/2018 19:54:46

[Ron LadenParticipant @ronladen17547]

Araldite chemical metal would be better than standard Araldite epoxy, Devcon do a good range and as Jason suggests, JBWeld is very good and fuel proof.

Dont know if it is true but I was once told that the rapid set adhesives are not fuel proof but the slower set time types are.

Ron

 

Edited By Ron Laden on 08/09/2018 20:47:04

Edited By Ron Laden on 08/09/2018 20:49:05

Edited By Ron Laden on 08/09/2018 21:01:21

[Trevor Crossman 1Participant @trevorcrossman1]

Most epoxies cannot be relied on for long term 100% resistance against petrol based fuels with the exception of those which are specially formulated for the construction of composite fuel tanks and they tend to be more expensive than standard lay-up epoxies, MAS is one such resin available from http://www.ecfibreglasssupplies, though I doubt that you would want the stock quantity. A better alternative for such a small task would be to use an aviation standard fuel sealant PR 1440 which is a virtually indestructible synthetic rubber compound and will resist attack from all forms of gasoline and its additives, it can be obtained from Light Aero Spares or other aviation suppliers, maybe you might know an aircraft maintainer who could get you a small amount.

Trevor.

[JasonBModerator @jasonb]

That's why I said the "Original" JBWeld as the faster cure ones don't have all of it's properties and I have heard the same said of Araldite.

Few of its properties listed here including petrol Proof

Edited By JasonB on 08/09/2018 20:53:27

[AJWParticipant @ajw]

Thanks guys, I have milliput and nowhere in its writeup does it even mention any type of fuel so I am thinking perhaps not. I also have some original JB weld which once again does not mention any fuel exposure.
Edgar himself suggests Bondafiller but unfortunately I think this particular product has disappeared over the years.
The rubber compound sounds good, will look into that, I guess not to be confused with silicone rubber which swells enormously!

Alan

[AJWParticipant @ajw]

Just had a thought, at the last ally pally exhibition I was very impressed with some demonstrated aluminium solder. Seemed to give a good fillet, just the sort of thing i am after. Having a thumb through the bay there appears to be quite a selection of aluminium soldering products
Anyone had any experience of any?

Alan

[JasonBModerator @jasonb]

AJW did you not read the link in my previous post where it says "When fully cured, J-B Weld is completely resistant to water, gasoline, and about every other petroleum product or automotive chemical"

Edited By JasonB on 09/09/2018 06:58:48

[Ron LadenParticipant @ronladen17547]

Posted by JasonB on 09/09/2018 06:58:36:

AJW did you not read the link in my previous post where it says "When fully cured, J-B Weld is completely resistant to water, gasoline, and about every other petroleum product or automotive chemical"

Edited By JasonB on 09/09/2018 06:58:48

+1

I once used JBWeld original to repair a hole in a motorcycle fuel tank where the adhesive was in direct contact with the petrol (hole was in the bottom of tank) and it was a permanent fix, never a problem.

[AJWParticipant @ajw]

Jason apologies for missing that, I wonder why it’s not put on the packaging and instructions?
Sounds like a solution – I shall update Edgar!

Alan

[Benjamin DayParticipant @benjaminday94198]

just to chime in and say the aluminium solders are very good….big grin on my face when i saw it worked. there are some Russian flux brands that work really well with the stuff too

[Pete RimmerParticipant @peterimmer30576]

JB Weld (not the quick one) is advertised as 100% resistant to petrol once fully cured.

[AJWParticipant @ajw]

I have just had another look at my pack of original JB Weld and it makes no mention at all of fuel suitability?
Strange as I would have thought that would be a good selling point.

Alan

[Ron LadenParticipant @ronladen17547]

Sounds as if you are not convinced Alan, despite Jason having sent you the JBWelds spec sheet….?

[AJWParticipant @ajw]

Yes, convinced and I am currently using it as I have for the past few years just find it surprising that it’s not on the pack!
Perhaps it is on a new pack, mine is quite old.

Alan

[Ron LadenParticipant @ronladen17547]

I dont know if its mentioned on a new pack or not but it made me think of one or two items I have used over the years which I always associate with a particular job. You then eventually read the spec sheet and learn that it can be used for much more.

Ron

[JasonBModerator @jasonb]

A sometime member here and contributor to ME and MEW has the soft jaws of his chuck stuck on with JBWeld, does not come into contact with petrol but shows that it is sticky stuff. He also tried some pipe joints as you would find on a model stationary engine upto about 300psi which is when his test pump would not go any higher.

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