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#1
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Sloshing compound is failing
Larry wrote: Jim: I don't believe it is the MEK that is so toxic. I was an organic chemist for many years. MEK evaporates very quickly and doesn't get past your skin surface. Uh, it gets past you rskin if it gets inhaled, right? There are lots of places where the MSDS is posted, usually in .pdf format: http://www.palomar.edu/ehs/Chemistry...L%20KETONE.pdf -- FF |
#2
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Sloshing compound is failing
Tim Hickey wrote:
I guess that it has been at least 18 years since I build the fuel tanks for my CH-300. They are of welded aluminum construction, and were sloshed with Randolph's sloshing sealer. The Alcohol resistant type, if I remember correctly. Today I drained the tanks so I can replace the fuel selector valve, which is enjoying a small leak around the selector shaft, when I noticed that there is a small flake of sealer that has cracked loose from the rest. Further examination shows that there are areas that look like small blisters are forming under the sealer. I suspect that this is not an unusual problem, as I seem to recall that others have had this problem also. The question I have, is what to do. It seems to me that the tanks need to be removed, (big job), and the sealer flushed out of there. I seem to recall that some were using MEK to cut and remove the sealer. Does this seem like the thing to do? Advice welcomed. Zenith CH-300 Driver. That has been a problem in the RV's, When I built my tanks in 1988 it was common practice in manufacturing to use Pro Seal on the seams and rivets and then Slosh the complete tank. Many builders had the slosh come loose and had to remove the tanks and and clean out all of the old slosh. Some builders just junked the tanks and built new tanks as that was the easier way to go in some cases. It seems that any chemicals that you use to remove the old slosh just gums it up and makes a complete mess. I have slosh in my tanks and and am reaching the 17 year mark with no signs of it coming loose but am keeping my fingers crossed. Van's have found that the tanks seal just was well just using Pro Seal with out the slosh. Jerry |
#3
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Sloshing compound is failing
On Thu, 12 Jan 2006 19:10:04 -0800, Jerry Springer
wrote: Tim Hickey wrote: I guess that it has been at least 18 years since I build the fuel tanks for my CH-300. They are of welded aluminum construction, and were sloshed with Randolph's sloshing sealer. The Alcohol resistant type, if I remember correctly. Today I drained the tanks so I can replace the fuel selector valve, which is enjoying a small leak around the selector shaft, when I noticed that there is a small flake of sealer that has cracked loose from the rest. Further examination shows that there are areas that look like small blisters are forming under the sealer. I suspect that this is not an unusual problem, as I seem to recall that others have had this problem also. The question I have, is what to do. It seems to me that the tanks need to be removed, (big job), and the sealer flushed out of there. I seem to recall that some were using MEK to cut and remove the sealer. Does this seem like the thing to do? Advice welcomed. Zenith CH-300 Driver. That has been a problem in the RV's, When I built my tanks in 1988 it was common practice in manufacturing to use Pro Seal on the seams and rivets and then Slosh the complete tank. Many builders had the slosh come loose and had to remove the tanks and and clean out all of the old slosh. Some builders just junked the tanks and built new tanks as that was the easier way to go in some cases. It seems that any chemicals that you use to remove the old slosh just gums it up and makes a complete mess. I have slosh in my tanks and and am reaching the 17 year mark with no signs of it coming loose but am keeping my fingers crossed. Van's have found that the tanks seal just was well just using Pro Seal with out the slosh. Jerry The tanks need to be clean and etched before sloshing so the slosh can bite.No oxide layer. Won't guarantee it will never peel, but if you get a good bite you won't get corrosion between the metal and the slosh, which lifts the slosh.Most slosh kits come with an etchant for steel. Use aluma-prep (Phosphoric acir IIRC) on aluminum tanks. |
#4
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Sloshing compound is failing
Don't use Randolph again. Ever. Use PRC 1005L Buna-N, available from Spruce.
The sealant is diluted in MEK, you pour, slosh, drain excess, let dry and you're done, and its impervious to any fuel additives. http://www.aircraftspruce.com/catalo.../sloshcoat.php "Tim Hickey" wrote in message ... I guess that it has been at least 18 years since I build the fuel tanks for my CH-300. They are of welded aluminum construction, and were sloshed with Randolph's sloshing sealer. The Alcohol resistant type, if I remember correctly. Today I drained the tanks so I can replace the fuel selector valve, which is enjoying a small leak around the selector shaft, when I noticed that there is a small flake of sealer that has cracked loose from the rest. Further examination shows that there are areas that look like small blisters are forming under the sealer. I suspect that this is not an unusual problem, as I seem to recall that others have had this problem also. The question I have, is what to do. It seems to me that the tanks need to be removed, (big job), and the sealer flushed out of there. I seem to recall that some were using MEK to cut and remove the sealer. Does this seem like the thing to do? Advice welcomed. Zenith CH-300 Driver. |
#5
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Sloshing compound is failing
Don't use Randolph again. Ever. Use PRC 1005L Buna-N, available from Spruce.
The sealant is diluted in MEK, you pour, slosh, drain excess, let dry and you're done, and its impervious to any fuel additives. I seem to remember the Randolph site says that 912 is no longer available. I also can't find on the 'Spruce site where PRC 1005L Buna-N is at all alcohol resistant. That said, has anyone tried that POR-15 stuff? Or the 'alcohol resistant' sealer on Hirsch Auto's site? I'm looking since my RV tanks are over 16 years old and starting to seep. Jim |
#6
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Sloshing compound is failing
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