Quote:
Originally Posted by Maximamike
When using muriatic acid it will strip all protecting materials off of the metal(wax, paint, clear, oils, etc). You must protect it with new paint or primer in order for it not to flash rust. If used on aluminum it will cause the aluminum to get stripped bare but then it will oxidize quickly. We use it when detailing big rigs at my shop.
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+1.. Sounds like you're removing the rust and leaving bare metal behind, that gets tarnished quickly because you're not protecting it. Try some primer or a clear, or something similar.
What parts are you using it on?