Whats the Best stop leak for Alluminum radiators

Sorry chopped, its common knowledge copper/brass radiators cool better. For some reason there are misconceptions that aluminum cools better. They even cost less then a quality copper/brass radiator. I'd buy a new copper/brass radiator they cool better and last way longer. My 46 ford convertible has a Walker in it going on 15 years. A repaired Chinese aluminum radiator will bite you in the ass when you least expect it. No way I'd use any stop leak. Plugs up heater cores and was told they cause premature failure of freeze plugs.
I learned a long time ago that when it comes to Brakes, Steering and Cooling buy the best. You won't be dissatisfied.