Spot the welders dog
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I came across the safety data sheet for POR15 Metal Prep and it contains 8.52% Phosphoric acid, 86.43% deironized water and 4.55 % Zinc Phosphate measured by weight. Yhat leaves a mystery 1/2% of something. Maybe the zinc phospate is the surface layer that it leaves.
Nonylphenol Ethoxylate. I considered mixing my own 'SpotsWonderLiquid' given the price for what is mainly water.