yeah that soap trick works well i had a pinhole in the side of my val ute fuel tank and repaired it with super fine dust i found in the chassis rails good shit and cheep to buy,another good to know fix is wheat germ or bran down a damaged radiator when a skippy broke the plastic grill and the broke part spered the radiator tube,within 30 secs of putting in the bran with the motor running no more leak
TT5 Matt