Hi
Yep whichever way you go success aint guaranteed unless you use a weld/solder repair. The the other problems of distortion etc come up.
No it is a petrol starting tank on an international petrol/diesel engine.
I haven't used a internal kit for a long time, the last one was called "splosh" it worked ok for me.
So I guess we are back at the "takes yer pick" point.
Ultimately I aint bin very helpful?
///
Mike