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CNKS
11-14-2005 11:48:18
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Re: Rusty Metal Prep - Sand Blast?-More Info in reply to Jim in OH, 11-14-2005 09:18:01
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Only an opinion. I have used Picklex on cast without problems, I imagine it will neutralize the rust in the pores. However, Picklex contains phosphoric acid, and an acid cannot be washed out, it must be neutralized. In my opinion, presented without proof, you should clean the cast after application, realizing that you won't be neutralizing all the acid -- I scrub the surface several times with PPG DX 330. The Picklex reacts with the cast, and any rags you use will come back BLACK, it will take several applications before you get a clean rag. It is not a quick wipe-down process, but the opposite. If you have access to a hot water pressure washer, or a steam cleaner, (I don't) that would be the way to go, even then I won't guarantee you have removed all the acid, but I don't think it will cause problems later. As to sandblasting, if you can keep the sand away from places where it will get into the tractor, that's ok, but I have never sandblasted a chassis, and that sand will find it's way into everything. All that said, I don't know how important a small amount of rust is anyway. There is almost always rust under old paint -- sometimes the old paint looks pretty good even over rust. I would be more concerned about it on sheet metal, as it can eventually eat all the way through, not so with cast. I have not used POR 15, and from what I have heard about it, I'm not going to. Whatever you do, do not use etch primer after Picklex. I don't believe you are supposed to use etch primer on cast anyway -- that's why I try to remove as much of the Picklex as I can. Sorry for the long post.
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