I always keep 870 reducer on hand and I think it is above any other brand I have used, I am only a part time hack at best but I strive to be the best I can be. I needed 4 ounces of cromax this week to blend a repair I had made on a Ram truck, my local supplier said that the reducer I had 870 was not recommended in their base coat. I am hoping one of you guys will chime in here and help me out, I have used 870 in all my base coats and in SPI euro clear but now the supplier is telling me that their reducer is superior. I am not sold on their hype.