i to had rust in my tanks but i did a way diferent repair than useing a chemical solution. i used metal b.bs that u use for a pellet gun i drop half a container in the tank after i removed the petcok and taped the hole up the i shook the tank for a while letting the b.bs hit the insides and then dumpped em out they were nasty rust color and the tank was cleaner then i did it agin with the rest of the b.bs with some denatured alcohol in with it to dry it up while cleaning it dumped out again and rinsed out with denatured alcohol let dry for a day then i mixed up some fibreglass resin with hardner and dumped in the tank to seal it up i swished it around the hole tank and dumped out the left overs let dry 1 day then did that step one more time and the tank was sealed from the inside removed the tape and chased the treads out for petcok due to a bit of the resin got on the threadsand i have not had rust come back now for over 2 years in my tanks that i have repaired hope this may be helpfull for some one that does not like harsh chemicals -corey
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