How will radiator stop leak work with Del-Cool antifreeze?

I wouldn't go that route. If the radiator leaks, remove it and have it fixed or install a new one. Then, refill with a 50/50 mixture of Dex-Cool and distilled water. It's best to do the job right. You don't want to take a chance and warp the aluminum head of your engine, as many on this site have done ($2,500+). Creating your own chemical brew is really not a good thing to do on modern-day cars.

You might enjoy reading these links:

https://www.askmehelpdesk.com/cars-t...tml#post235973

https://www.askmehelpdesk.com/cars-t...ml#post1365453

If you want to save money, buy a replacement radiator at your local salvage yard. From the Sticky, here are some tips regarding radiator hoses:

https://www.askmehelpdesk.com/cars-t...ml#post1393743