Agree with Bob
Just adding we always hone the surface as you want the product which is acidic to absorb into the stone.
Sometimes we will melt it into a small amount of water creating a paste like consistency. Cover with plastic overnight.
This seems to work pretty well but ofcourse depends on how much rust is involved.

Sent from my iPhone

> On May 15, 2022, at 9:39 AM, Bob Murrell - bmurrell at m3techinc.com <sccpartners@stoneandtilepros.simplelists.com> wrote:
>
> Depends on which Iron Out product you get. There is the powder and there is the paste.
> You can use either and mix with distilled water and/or Poultice Powder.
> Of course it will etch calcium based materials so be prepared to refinish. In fact, you may as well hone first before applying the poultice to open up the surface.
> Good luck
>
> Sent from Bob Murrell's iPhone
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>
>> On May 15, 2022, at 1:22 AM, Stephen Webb <stephen@newlifemarblerestoration.com> wrote:
>>
>> Hey all what works best to mix with Iron out to make a poultice?
>>
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