Editing Phosphoric acid as metal pretreatment

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The use of phosphoric acid-based products as metal pretreatment is controversial in hotrodding.

==Brands of phosphoric acid-based metal pretreatments used for automotive work==
*[http://ospho.com Ospho]

==Reasons for using phosphoric acid==


==Reasons for not using phosphoric acid==
*Metal pretreatment manufacturers are economically incentivized to recommend their products. A better point of view might be obtained from the manufacturer of the product that is destined to go on top of the pretreatment.

*Even a very low failure rate is economically disadvantageous, especially in light of the value of a professional paint job, and the labor required to fix a failure.

*A manufacturer's tech sheet may specifically advise against using an acid pretreatment. Always follow the tech sheets for the products you are using.

<blockquote>
''"Even though I believe I can use these products correctly I will not take such a risk when there are alternatives. It will only take 1 or 2 to put you out of business or in court."'' --'''shine''', in [http://www.hotrodders.com/forum/ospho-factory-response-173513.html#post1234352 this post on the Hotrodders Bulletin Board].
</blockquote>

==Specific paint and primer failures caused by phosphoric acid pretreatments==
*Bubbles of paint lifting, especially at seams.
*Epoxy cracking.

==Published epoxy primer and paint manufacturers' positions on the use of phosphoric acid pretreatments==
spi techsheet link goes here

==Use of phosphoric acid in an industrial setting==



==References==
*http://www.hotrodders.com/forum/ospho-factory-response-173513.html
*http://www.ospho.com/directions.htm