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I used Kreem on my old Yamaha's tank, it was a pain in the butt to do it right because of the big holes in the tank bottom. But once finished it did seal up all the pin holes completely.
Did it over 3 years ago and it still holds gas fine with no leaks.
Big problem I had was getting the excess stuff out after it was done. Had to drill a hole in the end and braze a nut on to make a central drain. Just needed a soft gas proof washer and the right sized screw in the nut afterwards to plug thehole. Has the added benifit of making it easy to drainthe tank now.
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Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
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