Driveway Stain Help Please….

Any Acid will destroy the concrete, it will get in the pores and slowly cause a attach on the material, it will destroy it like ASR attack,  

call @Pennywise he deals with concrete, 

 
@J Alper really... thumbs down????

Ok.

I just thought it was funny!

:cheers:

 
being it was already covered in acid i would just get some muriatic acid and wash it down. 

 
dbart said:
I think they look like that beforehand, knowing what he's in for! :bag:

:lmao:
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but the acid will take the top cream matrix off and then it will not hold anything back, but if the acid already took the matrix off the top, then it does not really matter anymore, the acid will slowly eat away at the concrete, you will need something to naturalize the acid after it is cleaned, 

 
J Alper said:
but the acid will take the top cream matrix off and then it will not hold anything back, but if the acid already took the matrix off the top, then it does not really matter anymore, the acid will slowly eat away at the concrete, you will need something to naturalize the acid after it is cleaned, 
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Alper knows some stuff....

It seems this is a trend now in the concrete biz is to give a "salt and pepper' look by removing the "cream"  and exposing the sand. It gives it a subtle look of a satin grey concrete. When the concrete is finished and before set they will use a product called Top Cast https://www.daytonsuperior.com/products/chemicals?name=top-cast- It seems the way of the stamped color concrete is falling off for for this look . Mostly due to the part of the constant maintenance and slickness of it.

You could acid wash ( I would not do it yourself, hire someone that knows what they are doing) To achieve a uniform finish to expose the sand aggregate. Then you can apply sealers to seal and strengthen the surface. You could do this to old concrete to get rid of surface stains but penetrated stains are there to stay. You could lightly stain your concrete with some diluted black and greys or browns to give it a custom look before sealing that would help hide previous stains.

 
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RK Racing said:
For that spot that you cleaned up, approximately how much of that bottle did you use? Thanks.
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Maybe 1 quart. I wound up using 7 gallons over a very large area. after cleaning the rust, the concrete was white. I liked it so much, I just sprayed the entire area to even it out. It's $9.48 pr gallon at Home Depot. I found that all stores don't carry the same inventory for some reason. I bought it at the Covina store. 

Some areas required a second treatment due to the density of the rust. 7 gals did about 750 sq.ft.

 
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