Phosphoric Acid Did This. Here’s How I Fixed It

After phosphoric acid cleaned the rust, it left behind a white phosphate crust that absolutely had to come off before epoxy primer. In this video I go through the chemistry, the failed experiments, and the final pH-balanced wash formula that actually worked. We test citrate, pH, corrosion inhibitors, and surfactants, then use the winning formula on the engine bay to get back to clean steel ready for bodywork. The final rinse is 50/50 mix of hardware store ammonia and distilled water , and 200:1 TEA. So 500ml ammonia , 500ml distilled water and 5ml TEA Chapters 0:00 The white crust problem 0:27 Why it matters before epoxy 1:07 Failed fixes: water and more acid 2:02 Controlled FAFO 2:42 Why citrate 3:52 Test tubes 5:02 Steel panel tests 6:10 Results 8:02 The formula 10:53 Mixing it up 13:15 Real-world cleanup 13:44 Final procedure 15:34 Next episode preview