This is a house we worked on to remove 7 coats of Behr Liquid Rawhide Stain. The behr stain was still soft to the touch and the last application had been 5 years ago. There were signs of mold growing within the behr stain which resulting in the logs to turn black. We had to use 40 grit carbide disks to remove the stain since blasting was not an option.