I seen discussions on using bars stop leak instead of GM coolant tabs, but nothing on Bar's "Liquid Aluminum" radiator, stop leak. Does anyone have an opinion on this product. Just bought a 94 Deville, and will drain and refill the system this spring. For now though, I want to make sure that I have the proper stop leak powder, (or tabs) and then top off system. Any help and thoughts on this product will be greatly appreciated.