I would love to know how I gained the reputation of having no knowledge of the material (POR-15). I have only used it to cover the interior of my wheel wells, cross-member, and frame rails. Using POR-15 requires careful surface preparation. You must start with a clean surface first and foremost. How you get there does not matter. As long as the surface is clean and free of grease, etc. that is all that matters. They recommend using their water-based Marine Clean and say that kerosene or solvent-based degreasers should not be used as they may leave an invisible film. However, they do NOT come out and say you MUST use Marine Clean. Do any of you disagree? Once the surface is clean, you must etch the metal. They do not say you MUST etch, but we all know that you should etch the metal, especially a new metal. You can use either Metal Ready or phosphoric acid. Do any of you disagree? After etching, you need to clean the surface again to remove the excess Metal Ready or phosphoric acid. You do this by wiping it down with a wet cloth. Once the excess is removed and the surface is dry you can then paint using POR. Now, where am I wrong in any of that? It is recommended that you use Marine Clean to remove any grease on the surface, but the intent is to make sure you have a clean surface. It does not matter HOW. Edit: I am trying to give back to this wonderful community by sharing the knowledge that I have gained. I am not the type to post something if I have any doubt, as I know that it will show up in a search.