I've seen where others have had real good success with these products. I've had good results with the PPG Metal Cleaner as a prep for paint. I forget now what I used that on, but I remember it turned out awesome. The Purple Power DeRuster and the Jasco Prep I've seen others comments on the internet, so you know that makes it true. The Jasco Prep is pretty cheap in comparison and worked as an alternative for prepping for POR15. I have not tried it yet, but I did buy it at Lowes. IIRC, it was like $8 for the quart. If anyone else has had success or failure with alternative prep products, let us all know. Some of us have to save where we can without taking shortcuts and having a nasty result.