Good morning,

 

We have a 30×16 cement slab.  We hired a contractor to fill in 10 holes (image #5), sand the concrete to remove the old pattern & smooth it out.  Then stain the cement to look like the one pictured in this email (image #2).  They brought 2 handheld sanders with batteries.  Sanded as best they could, and then put one coat of Eagle Acid Stain.  It came out like this. (image #1)   How can we fix this?

 

I have attached images of before and after.