Hi All,
We machine some medium sized castings. I am looking for something to detect cracks in the castings. I have used the 3 step spray in the past. In looking at different products, is the 3 step spray the best choice for spot checking periodically? I did notice that I can get a kit with a magnet and a black light, of course for more cost. I am just wondering if anyone has used both products and if the one with the magnet and black light is that much better.

Thanks in advance.