You can fix rust pits with plain old vinegar, that won't leave any kind of phosphate or oxide. Keep it wet for 30 min, even if you need to tape a rag over it. Wash with dawn dish soap and water, and small brush . Thoroughly dry it off as a soon as you can. You can then use your SPI. epoxy if metal and paint Temps are both at least 70 degrees and not in direct sunlight
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