fuzzybabybunny Posted December 13, 2016 Share Posted December 13, 2016 Just wanted to share this. I had multiple cracks in my plastic fuel tank where the brass fittings screw into the plastic. Gasoline would rush out pretty quick as soon as my paramotor would go horizontal (like laying it on its side in the car) and of course the petrol smell sucked. I tried Goop adhesive but petrol ate through it. It would eat through silicon as well. A guy at the auto shop recommended me this: https://www.google.com.au/search?q=rapid+fix+adhesive I've used it on my tank and so far it seems to be holding up. No leaks. I'm currently in the process of doing a prolonged submersion test and I'll let you guys know how it holds up. It was either this or pay Backbone $200 to mail me a new fuel tank or pay someone to do plastic welding. I think this adhesive was the best option. Sets and hardens in less than 10 seconds. Quote Link to comment Share on other sites More sharing options...
kiwi k Posted December 13, 2016 Share Posted December 13, 2016 FB could you not use the electric hot glue gun type, as i know it forms solid but still with a little flex Quote Link to comment Share on other sites More sharing options...
fuzzybabybunny Posted December 13, 2016 Author Share Posted December 13, 2016 (edited) 3 hours ago, kiwi k said: FB could you not use the electric hot glue gun type, as i know it forms solid but still with a little flex Naw, hot glue is Ethylene-vinyl acetate (EVA) which is not chemically resistant to petrol. http://www.rxplastics.com.au/resources/RXChemicalResistanceGuide.pdf Even if you were to use a proper plastic welding kit you have to select the correct type of plastic for fuel because not all plastic is the same. Petrol will dissolve one and not the other. The adhesive that I've used is chemically inert to petrol. Edited December 13, 2016 by fuzzybabybunny Quote Link to comment Share on other sites More sharing options...
kiwi k Posted December 14, 2016 Share Posted December 14, 2016 There is another way i would suggest but its a dark colour in both forms, and that my young man is Q-Bond and its fuel friendly and they supply both plastic and metal repair products, have used the metal type on the inside of a carburetor float bowl immersed in fuel and still stuck 8yrs later. Quote Link to comment Share on other sites More sharing options...
fuzzybabybunny Posted December 14, 2016 Author Share Posted December 14, 2016 (edited) 4 hours ago, kiwi k said: There is another way i would suggest but its a dark colour in both forms, and that my young man is Q-Bond and its fuel friendly and they supply both plastic and metal repair products, have used the metal type on the inside of a carburetor float bowl immersed in fuel and still stuck 8yrs later. So after doing some research, Q Bond and RapidFix look to be the same thing. They are both a two part liquid and filling powder adhesive with the same chemistry. Checking the MSDS (Material Safety Data Sheet) for Q Bond, it appears the primary ingredient (99%) is ethyl cyanoacrylate. You know it as normal super glue. Super glue forms a polymer when it comes into contact with water, mostly water molecules on the surface of the material you're adhering. And yes, it's gasoline resistant. The filling powder is a bit more mysterious, but I will guess that it is simply a form of powdered ceramic or metal. It adds 3-dimensional structure as well as more holding power, stiffness, and filling of nooks and crannies compared to just the liquid portion. It's basically like a micro-cement, and yes, both parts are very resistant to gasoline. You can make your own Q Bond or RapidFix by buying super glue and using it with fine beach sand, powdered iron, or powdered ceramic. Just did the overnight submersion test and there were no leaks of any kind and the material showed no weakening at all. I consider the fuel tank fully repaired. Edited December 14, 2016 by fuzzybabybunny Quote Link to comment Share on other sites More sharing options...
flyprop Posted December 29, 2016 Share Posted December 29, 2016 Hello! I repaired a tank with a piece of the same plastic,a heat blower,a file,sandpaper and patience.It deformed a little bit in the reparation area ( you can avoid it working slowly). Worked great... Quote Link to comment Share on other sites More sharing options...
curb Posted July 25, 2021 Share Posted July 25, 2021 Does not epoxy do the job? Quote Link to comment Share on other sites More sharing options...
admin (Simon W) Posted August 15, 2021 Share Posted August 15, 2021 Epoxy is great for repairing things that are made with Epoxy Super Glue is crazy stuff... It's even safe in a reef tank!! (used to stick corals to rocks) which I still cant get my head around. lol SW Quote Link to comment Share on other sites More sharing options...
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