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Nipper composite fuel tank

Posted: Thu Mar 14, 2019 5:54 pm
by JimCrawford
I've tried the LAA forum and even emailing LAA engineering with no response so I thought I try here. My fuel tank has developed a leak along a riveted seam. I've been searching for a composite system compatible with E5 mogas in order to lay up a fuel tank. The most likely candidate I've found so far is Spruce and Speciality part number Part Number: 01-01109. A vinyl ester system. I'd be interested if anybody has any suggestions or experience with this problem.


Re: Nipper composite fuel tank

Posted: Thu Apr 11, 2019 3:06 pm
by ragson
Good morning.

There is a very popular french brand, "Restom" (, rather specialized in collectible motorcycle, selling a very efficient product for leaking tanks. I personnally used several times and never failed.
The site is in french but they speak english and sell worldwide. Regards.

Re: Nipper composite fuel tank

Posted: Thu Apr 11, 2019 10:55 pm
by JimCrawford
Hello ragson.

That is a very interesting website, I'll certainly chase up some of their paint products.

The specialist composite tank repair product isn't suitable for my purpose as it is essentially a sloshing sealant and I'm not happy with using sealants on a tank which has started to fail. I cannot guarantee the stability of the surface of a 1960s composite tank after exposure to mogas. Also many of the reports I've read on such sealants in aero and marine tanks have indicated that less than perfect preparation will lead to the sealant peeling from the tank. My enquiry is for a composite scheme to build a new tank that is compatible with mogas incorporating alcohol. A secondary issue with mogas causing failure of resin systems, is that the products of the interaction will also be carried into the fuel system with uncertain results.

I've trawled through many resin systems and haven't managed to find any which are completely compatible. There is one vinyl ester product which is a possible but I cannot find it in other than industrial quantities. If I could source something that looks promising I'd make up some test coupons with the tank and test them year by year immersed in mogas.

It looks as if the quickest solution to my problem is to remake the composite part of the tank in aluminium.