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Originally Posted by ProTouring442
Also, the Fusor information says the stuff will bond despite an oily surface, so you shouldn’t need to do anything crazy to clean them out.
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There is a very noticeable difference in adhesion in my experience if it's applied to a poorly prepped surface. The final result will be stronger if it has strong adhesion to the metal, and as long as it's stuck that minimizes the chances for moisture to get between the foam and metal. Any prep is better than none at all. For a rocker panel I would probably open up one end and drag a circular wire brush through to knock off any loose crud followed by a solvent spray. For a frame or body, money no object best bet would be to hot tank/acid dip/etc clean it, e-coat it, then immediately do the foaming on the fresh e-coat.