I have a small corrosion leak near where the water pump hose hooks up to the bottom of the radiator it only leaks after i drive it and leaks at quite a rapid pace leaving a large puddle. is this beyond repair or will some JB weild or somthing take care of it any recomondations. or am I going to have to look for a new radiator.

Be sure it is not that the radiator hose outlet has a cracked solder joint or a bad hose.

For any epoxy product to work, the surface must be clean and dry, like in shinny bare metal.
Good epoxy takes hours to dry / cure. High heat is not good for epoxy over the long haul.
My though is that for all this trouble, may as well pull the radiator and have a shop boil it out & repair it.
DD

My Local man was going to charge around $75.00 more to repair my leak then the cost to have a 3 core built, gives one something to think about as my leak was also minor, also has been my experience that some auto parts places pierce the bottom radiator hose with a nylon loop to hang on the wall thereby producing two small pin holes in the hose right near the outlet which gave the appearance of a bottom tank leak, so would be good idea to inspect hoses before purchase.As far as the "liquid Steele" approach my only use has been on the overflow nipple which had a defective solder joint and i'm too lazy to solder it correctly this has worked well..My 2 cents is to do it right the first time.