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Old 11-13-2013, 08:07 PM   #29
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brooksville , Florida
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$800? Dang you could have one made out of Stainless, and it would out last all of us.
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Old 11-13-2013, 08:44 PM   #30
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1983 31' Airstream310
Hillsburgh , Ontario
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Take a sheet or two of 1/8" or 1/4" Lexan to a cabinet shop like mine. Phone around to find a shop with an AXYZ machine. It would take a good programmer maybe a half hour or so to program the machine to cut your top, bottom and all the sides. This would include all cut outs and openings. Then get some Weld 45 or other Lexan/polycarbonate glue and taking a couple of scraps to practice on, learn to glue Lexan together. The glue joint ends up being stronger than the material……..and Lexan is bulletproof. The great thing about the AXYZ machine is the ability to make all the pieces fit the sheet and cut curves. You can heat and bend Lexan for curves.

http://www.axyz.com
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Old 11-13-2013, 09:27 PM   #31
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Surprise , Arizona
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Here are pics from my 84' 310.
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Old 11-13-2013, 09:35 PM   #32
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Ottawa , ON
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It's right purty!
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Old 11-13-2013, 09:39 PM   #33
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Had a huge rat nest made from cactus and doghouse insulation on top of it. Made it REAL fun to take out!
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Old 11-14-2013, 02:14 AM   #34
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Can you post a close-up photo of the crack? I also have a cracked BW tank. Mine is around the flange fitting. Apparently this is a not to uncommon failure with these above floor tanks due to having the weight of the toilet directly above and not enough additional surrounding relief for the flange fitting. Unfortunately, a PO attempted to patch with silicone-- woefully inadequate.

I will be trying to plastic weld mine. Seems your tank is polyethylene, as is mine. I have researched the topic and methods and know just enough to be dangerous. But I figure it's worth a try before I scrap it. If interested, here is some pertinent info: 1. Epoxy & Fiberglass patches won't work (according to experts) 2. Like sticks to like: must be exact type of plastic (eg. low density polypropelene to low density polypropelene 3. Different materials have different optimum working temps. 4. Drill small holes at either end of crack to prevent migration & weld. There are a few seemingly good U-tube vids using plastic welders to soldering irons to torches. With a clean crack it may be possible to clamp it together and weld the seam together without additional material, although that would probably require a big leap of faith.

One potential drawback for you is that the crack is on the bottom and will be subjected to stress at all times tank is used. Mine is at the top, so if properly supported (which I plan on), needs mostly just a good watertight seal- but extra reinforcement will still be given, of course.

I bought some polyetyhlene cutting boards to practice on and, depending on how that goes will start working on the tank. I'll post about it as I go.
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Old 11-14-2013, 10:05 AM   #35
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My tank is cracked all across the bottom. The entire bottom section is dried out and brittle. I was planning to just patch it with MarineTex but realized the deterioration was to extensive.
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Old 11-21-2013, 09:51 AM   #36
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Total Plastics in Phx is going to attempt to cut out the bottom and weld a polyethylene sheet to the bottom of the tank. They're concerned about the weakening effect of the welding process to the old plastic, but at this point I really don't have any other options. I'll post results.
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