T&T: Black Iron Fuel Tank Leaking

[TAMPAKOA at aol.com]

I am seeing that dreaded red streak coming from under one of my diesel fuel  
tanks and am now doing some research to determine my options for dealing with  
this situation.  The tank is low in the hull and was designed and built to  
conform to the "V" shape of the hull and I can not see any of the tank  after 
it disappears below the stringers and the leak seems to be hidden in this  
lower section of the tank. I will be able to access the tank through the top  
after removing the floor that covers the tank.  
 
Welding may not be advisable so I am looking at a number of  options for 
cleaning the tank and sealing it from the inside.  There are  several products on 
the market referred to as "Slosh Sealers" which have  apparently been on the 
market for many years but most of them seem to have  been developed for 
aluminum aircraft tanks.
 
I'm hoping that some of you may have used one of these or similar products  
and might be able to give me some first hand advice based on your  experience.
 
_Click  here: POR-15 Depot - POR15 :: Fuel System :: POR-15 Fuel  Tank Sealer 
- Pint_ (http://www.stoprust.net/POR-15-Fuel-Tank-Sealer-Pint-p-49.html)  
This one is called a moisture cure urethane sealer
 
 
_Click here:  http://www.damonq.com/TechSheets/Red-Kote.pdf_ 
(http://www.damonq.com/TechSheets/Red-Kote.pdf)  
This one is a polymer product that supposedly stays flexible and will never  
crack of peal off
 
 
 
_Click here:  PR-1005-l BUNA-N-SLOSH COATING from Aircraft Spruce_ 
(http://aircraft-spruce.com/catalog/cspages/sloshcoat.php)  
This is a rubber based product distributed by the aircraft and plot  
suppliers.
 
A forth and obvious product is epoxy from a company such as West  Systems.  
My concern here is that epoxy may be too thick and may not flow  into and seal 
pin holes although I could most likely overcome that objection by  thinning 
the product.
 
If any of you have experience sealing a diesel tank from the inside using  
one of the products or types of products mentioned above I would surely  
appreciate learning from your success or failures. If anyone has had success  with 
any other products  please tell me about it.
 
John

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