962 I was hoping you would chime in on this. I will resand the entire area again to remove all ospho. I have a spot blaster that I have never used so I'll see if Home Depot or Lowes have the #000 fine sand. If not I'll locate a masonry store. I'm assuming that if I still see any part of the black spots remaining that it's still there and I need to keep blasting. I took a picture of the label and it seems that you can apply primer after using but as you say it's not worth the chance. It's been a ***** to get it to this point and I don't want to waste all this effort. Thanks again there will probably be more questions as I progress on the project.
