Clear Ethanol Proof Fuel Tank Sealer for Tanks up to 33 Litres

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Clear Ethanol Proof Fuel Tank Sealer for Tanks up to 33 Litres


The only truly Ethanol proof fuel tank sealer that has been available for over 30 years

The amount of Ethanol in fuel now is causing a problem in older Metal fuel tanks and a bigger problem in Fibreglass and Plastic fuel tanks making them porous, this problem will only get worst as the volume of Ethanol added increases in order to make Petrol more Environmentally Friendly.

Using our Fuel Tanks Sealer will create a solid seal within the fuel tank, and make it Ethanol proof permantley, If your Metal fuel tank has had a tank seal fitted previously, this would need to be removed before applying the new sealer, most Kreem and POR15 sealers will fail, sometimes very quickly, so we have developed a Products that will remove these products.

This product works on Vapour and Liquid, so 1 Litre is enough to clear the old sealants from the largest fuel tanks  

If you need a Fuel Tank Seal Remover then please CLICK HERE>>>, and this will take you straight to the product, were you can add to cart. You may also find that you fuel tank is rusty, and you will need to remove the rust first before applying the Tanks  Sealer, Again we have developed a product that is specifically for removing the rust in fuel tanks, Simply Mix 1 Litre with 9 Litres of water, and leave overnight, and this clean you fuel tank thoroughly and after a wash out is ready to seal Our "Rusty Metal" Rust remover, can then be placed in a bucked, the rust sieved out, and used again and again on other fuel tanks, and anything that you would like to De-Rust. If you need a Rust Remover please Click Here>>> and this will take you straight to the product were you can add to cart.

If you use a thinners to wash out the fuel tank, please only use Lacquer Thinners as most others contain chemicals that could react and cause the seal to weaken, some people use normal thinners and have no problem but without knowing what the thinners contains we can not guarantee this  If you need all 3 products, than it would be cheaper to buy our renovation kilt, which you can find here  by Clicking Here>>>

Fibreglass and Plastic Fuel Tanks

We advise against using our Tank Seal Remover in Plastic or Fibreglass Tanks as its to aggressive, the only way to remove the old seal is manually, once you have removed as much of the old seal as you can, it is best to wash out using Hot Water and a Dish Washer Tablet mixed, if there is any of the old sealer still in the fuel tank, as long as it is stable, it os OK to seal over the top

Painting Fuel Tanks after Sealing

If you are think of painting a Fibreglass or Plastic Fuel tank that has become porous, after you have applied sealer. please wait up to 4 weeks, after application, as there will still be Ethanol in the tank structure, and by painting you will trap the ethanol between the sealer and the paint and it will push back through, let it breathe out of the Fibreglass/Plastic, before applying the correct primmer  




Would you rather have someone do this for YOU? The following companies are using Caswell products for their tank lining service!

Motorcycle Restoration Company  (Saffron Walden, Essex)

Our team of five restorers have between them over 80 years experience working in the classic motorcycle restoration field.  They are supported by a comprehensive machine shop, and a wealth of historic technical data relating to the classic scene.  They are based in Saffron Waldron, Essex.

Contact them on Saffron Walden (01799) 542 323.

Hartlepool Radiator Company - Fuel Tanks 

This company based in the North East of England has a tanks division which has been doing fuel tank restoration on all types of vehicles for some time.  

They have used GTS1750 in-house and now offer a service to the motorcyclist/ car restorer in tank restoration.  Call Stan Lamb on (01429) 236300 and discuss your tank with him. Also look on the web page at

JBH Motorcycles (Andover)

Call John at JBH Motorcycles who runs a motorcycle company and a tank restoration service.  
John uses GTS1750 and can be contacted on 07507 827375

Anything Goes Racing (Waterlooville)

Jeep knows everything there is to know about using GTS1750, as the previous owner of Caswell Europe, he has promoted and used the product for many years.

He has worked on motorcycle and small car tanks aged from a 1909 SINGER to modern YAMAHA R1. If you need a tank resealed, Jeep can be contact on: 07778 265726 


Web Page:


Please note that our shipping prices are a higher than it would cost to send a normal parcel via the post, the reason for this is because any product that contains chemicals must be sent and packed as per the "hazardous goods" regulations, and be transported by a carrier that is licensed to be able to transport. we are unable to send by regular post as it is now a criminal offence to send undeclared hazardous goods, for postage rates please click on the tab above.


If you are a VAT Registered company in Mainland Europe, when completing the "New Account" form at checkout, as seen below, please enter your European VAT Number, it will then be verified direct with the EU Commission website, and you will not be charged VAT on your order.

(services are subject to the reverse charge and VAT is to be accounted for by the recipient as per Article 196 of Council Directive 2006/112/EC.)

For customers in Bosnia & Herzegovina, Gibraltar, Liechenstein, Norway and Switzerland, the invoice produced will automatically be free of VAT.




19 Reviews
  • 5
    excellent product.

    Posted by Bob Lowe on 25th Dec 2017

    I was recommended to use this on my Triumph Daytona 955 tank by several members of an owners group.
    I found it very easy to use with good instructions.

  • 5
    Casewell tank repair

    Posted by MARTIN BELL on 5th Oct 2017

    Its all we use and great product

  • 5
    Saved the day!

    Posted by Nick Woods on 10th Aug 2017

    I have several bikes with nylon tanks, and two of them have suffered degradation of the interior due to poor/old fuel. Fresh fuel carries dissolved plastic to the carb, which then repeatedly blocks the jets as the fuel vapourises. Caswell epoxy liner has cured the problem on one bike, hence the latest order for treatment of the second tank.

  • 5
    Fibreglass tank.

    Posted by Frank Grimley on 8th Aug 2017

    This product seems to work well. After 1 year no issues with my fibreglass tank. I am using it again.

  • 5
    Does what it says on the box

    Posted by TIMOTHY ROBERTS on 4th Jun 2017

    Used this great product on my leaking Norton petrol tank, easy to use and works really well. Will use again on other projects if needed.

  • 5
    sorry I took so long

    Posted by Unknown on 20th Apr 2017

    This stuff is so easy to use I surprised my self.
    I took a while to get started as with anything new I'm reluktnt touse it .Like I said so easy

  • 5
    Life saver

    Posted by Gerald Hitchcock on 25th Oct 2016

    I have used this product on two other motorcycle fuel tanks, with great results. The first time was on a glass fibre tank belonging to my Cotton trials bike, the ethanol in modern fuel had started to break down the resin. Before it was to late I washed out tank and used caswell tank sealer to try to save it
    It was a total success. This was about 5years ago. The 2nd time was on a rusty metal tank, again I was successful using caswell tank sealer to save it Thank you Gerry.

  • 5
    Glass hard perfect proofer

    Posted by David Sutton on 19th Oct 2016

    I had a super rare tank which after rust removal lost half its weight in removed rust. Not quite paper thin in parts but certainly easy to dent the tank did not actually leak. I used the tank sealer to build a super strong supportive backing with the bonus of knowing any further corrosion would be stopped in its tracks. What a result exceeded all my expectations. Not the cheapest sealer but for me its a no brainer.

  • 3
    Product too thick to cover effectively.

    Posted by nigel keating on 17th Oct 2016

    I spent hours getting everything to the recommended temperature and in fact was 1c above but it was impossible to get it to cover the whole area inside the tank. I rotated and turned the tank every which way for 30 mins and I finally resorted to painting it on all the missed areas with a long brush using a torch to see what I was doing. Luckily the tank had three holes I could work through. The product was clearly too thick.

Question. My Fuel Tank has an existing seal from another product that has started to flake due to the high ethanol content in fuel today, will Caswell GTS1750 suffer the same problem Answer. Unlike other manufacturers that claim there product is ethanol resistant, ours is 100% guaranteed, we sell 1000s of Sealer Kits each year and have never suffered a failure from the ethanol problems. Question. Can I apply the Fuel Tanks Sealer over my old tank seal that is flaking. Answer. We would highly recommend that you remove the old seal first, we sell a Fuel Tank Seal Remover that will remove the old seal, it costs £16.68 a litre which should be sufficient for most size tanks, its simple to use, just pour in, and it will reduce the old seal back to a resin type material that can be poured out.