A7 ST petrol tank leak - weld or tank sealer?

[Greybeard]

BSARGS650,
PM sent

[bikerboy]

My personal opinion, for whats its worth, is always going to be solder, silver solder or weld.

I dont trust the sealers and altho I have not tried the one you are talking about I have tried a few others and never had much joy at all.

Yes it ruins your paint but at least its done and dusted

[coater87]

 The only tank sealer I have never heard one good thing about is "kreem".

 From what I've heard is it doesn't work at all, 
Then you get to try to get that crap back out.

[muskrat]

Ha, I found a way to remove Kreem. Methanol eats it! I used it to seal my alloy oil tank on the racer. The methanol blow by the rings mixed with the oil and started on the tank. A big flap of Kreem covered the outlet and starved the motor. As the oil pressure dropped I stopped the motor. Couldn't find anything wrong and started with full pressure. A few minutes (half a lap) later no oil pressure. Found it by chance. Jammed a spring in the outlet fitting to hold off the Kreem and kept racing.
When I got home I filled the tank with 99.9% racing methanol. 2 days the Kreem was gone.
Cheers

[Joolstacho]

Heeheeheeeheeee!

[atkin]

I cleaned out my tank with Evaporust which was useless only removed a small amount of rust . I then cleaned with water and a final swirl with petrol and oil . The bottom of the tank looks ok but when I put a finger inside around the filler hole a brown sludge is there which is likely flash rust and keeps coming back .
The POR 15 website instructions say only do as a last resort ! I wonder does using these chemicals have a long term effect on the metal .