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  1. #1
    Member Freshman Undergraduate
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    Jan 2017
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    jonesboro arkansas
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    Rust on slate tiles.

    Customer had a drain from an AC unit coming out on the ceiling of his front porch (??), and it rusted the slate tiles up. I tried using half water, half F9 and it didnt seem to do much. Used straight F9, sprayed a couple of coats on a tile, and still didnt see much change. Is there a trick to getting the rust off of these slate tiles? (BTW, I'm assuming it's rust.)




  • #2
    Member Associate Professor Craig's Avatar
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    Feb 2012
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    Palm Desert, CA 92260
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    Hi Jason,

    Rust can sometimes have other minerals in it, like lime, potassium, calcium, magnesium and more. When this is the case and BARC won't cut through it you will need some help with F9 Efflo, I would go 4:1 water to efflo on the tile, scrub then surface clean. Efflo by itself may also remove the rust, but if there is still some rust left then you could use the barc to finish it off.

  • #3
    Member Honorary Professor CL Scott's Avatar
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    Aug 2013
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    Houston Texas
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    1,276
    Quote Originally Posted by Craig View Post
    Hi Jason,

    Rust can sometimes have other minerals in it, like lime, potassium, calcium, magnesium and more. When this is the case and BARC won't cut through it you will need some help with F9 Efflo, I would go 4:1 water to efflo on the tile, scrub then surface clean. Efflo by itself may also remove the rust, but if there is still some rust left then you could use the barc to finish it off.
    This guy knows his stuff!

  • #4
    Member Freshman Undergraduate
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    Jan 2017
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    jonesboro arkansas
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    Thanks Craig! Ordered some F9 Efflo to give it a shot.

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