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I have used an epoxy product from Caswell to coat a tank. It's very thick and would deal with pinholes pretty well. I suspect that tank will have quite a few pinholes once it's properly cleaned. It might be hard to do in an apartment setting...

I hope you have access to a lift, if not get the car as high as you can and from previous experience have someone to assist. I have the same set on my car. They are close but far from perfect. It’s tight underneath there. Biggest problem I ran into was getting them past the undercarriage near the rear passenger wheel where they shoot straight up and over. It can be done obviously. Wish I had done it on a lift it would have made it a lot easier. Also it’s going to arrive in a tall box where you have to use a tubing tool to straighten out the long straight lines. They will come marked at each point of the run. Purchased mine on Amazon.

Mine were more crud from leaving old gas in them for too long. The tanks were good and solid after I pressure washed the outside of them. That muriatic acid made the inside like new but after sloshing around for 5 minutes I had to pour in about 3 gallons of mixed ahead of time baking soda and water to neutralize the acid then emptied that into an empty 5 and killed a lot of ant beds around my property. Then the acetone to remove the water, quick hit with the leaf blower and then the Red-Kote. Sloshed that around completely covering the tank and let that drain out into another 5 then direct sunlight for 30 minutes, then another round with the leaf blower. Then I put that bitch on a shelf and got drunk. It was very nerve wracking for this 'ol boy, but when all was said and done I was and still am proud of what I did. You see, I hate following directions.

Good thread! I get to pick my DD based on need... 2000 Lexus LX470 (Landcruiser) But mostly drive this daily: 2014 BMW Z4 (E89) Manual

I just used the link that Zkars provided in his #2 post. The Gyraline website currently features their Black Friday deal and offers the option of having the price displayed in the currency of the customer's location. IIRC, I had to select the 'G1' (iPhone) or 'G2' (android) product first, add it to my Cart, and then go to the Cart to see the price. I tried this posing first as a Canadian customer, and then as a American customer. The quoted price in Cdn $ for a Canadian customer was significantly higher (numerically) than that for an American customer -- but maybe that was purely the result of performing a currency conversion. Additional costs for shipping/handling and duties/tariffs might get tacked onto the Canadian price afterwards and not become visible until later in the check-out process. A quick internet search indicates that Gyraline was incorporated in Delaware in March 2024, with operations based in California and Texas. I have no idea where they do their manufacturing. Given the the nature of the design and the relatively low production volumes, it could be as simple as contracting out to a US-based additive manufacturing company ('additive manufacturing' = commercial-grade 3D printing).