Quote:
Originally Posted by masraum
I assume you want to be very sure that you then neutralize any acid with a base (baking soda) and then thoroughly rinse any remnants of the acid.
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I’m sorry. I don’t think I was clear. By “pure” I didn’t mean high molarity, I meant unadulterated by polymers or other protective finishes. I don’t know the molarity of pre-paint acid washes is, but use something like that. It will convert the iron oxide to a softer, more easily removed compound. Basically you don’t want the product to remove the rust that obstructs free movement just to replace it with something else that will obstruct free movement of the door against the jamb. You want to remove the rust, then add your own protectant that is also lubricating.