I know taking care of a few aipstasia(spelling?) on some rocks isn't that big of a deal. A little Joe's Juice or similar product and it seems to do the trick. However, when 75lbs of rock is completely infiltrated with this stuff, nothing will help. With that said, if this rock is dried out for a long time and then recured, can I assume that the aip. will not automatically come back? In other words, if it's completely covered now, is it hopeless?