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Old 10-03-2012, 05:54 AM
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Originally Posted by TARM View Post

Is there some reason you can not just use a 0-14 PH testing strip on the metal surface after all the steps DBM does prior to spraying primer and see what you get?
Yes; pH strips require full immersion in the solution for which you are testing the pH and they need to be completely wet. Touching it to the metal would not give you a good reading.

Seems like a really simple and 100% way to put this to bed. I can not see how there could be any argument if the PH comes back somewhere around in the middle of the PH range. A 85% Phosphoric acid solution has a PH of about 0.5 PH so we are not talking some small change here.
You're only looking at pH and not chemical compatibility.

Wiping off clean with a rag soaked in wax & grease remover (I think this may have a big effect)
You would have to clean the metal with wax and grease remover anyways. But it's nothing I count on to neutralize an acid.
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