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Originally Posted by Blown353
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.
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Well I am working with a new Dynacorn body shell, so I am thinking I should let the body guys do their thing (since this may involve breaking loose some sheetmetal and re-attaching properly given the sh*ty alignment of one of the quarers) and then shooting atomized lacquer thinner through the rockers/a-pillars/b-pillars/rear frame rails/other target areas before injecting the foam. This is probably the best cleaning I can hope to achieve given the restricted access to these areas. Good enough? No acid dips or hot tanks available in my area as far as I am aware. Thanks.