Wow what a great product. I tried the regular JB Weld (also a great product) but it didn't work. This product is designed for radiators with a fast curing time of 30 minutes. Loved the blending, sandpaper, application brush, fiberglass etc. What a great design. It was easy to use and I was done in 20 minutes. Whether it lasts or not, it gives you an easy try before an expensive repair. I believe it saves 300 to 400 dollars! The hardest part was getting it to my neighbor's door, not mine.