I am the second owner of a 42 year old home on the Outer Banks of North Carolina. The former owner had a leak around the chimney which resulted in spaulding on the side of the brick chimney on the inside (painted) surface of the room. The previous owner claimed to have fixed the problem. I, in addition, have remodeled the house and there is now a new roof with new flashing at a higher level up on the chimney which should have added additional leak prevention. I have also coated the outside of the chimney with a silicone coating. I have done everything except put a plug in the top of the chimney. Since I don't use the fireplace, I can do this. Anyway, there is either a continuation of the leak or the spaulding is residual. I have now scrapped the spaulded area (about 2 feet by 7 feet) and find the bricks very soft. I can literally scrape a line or flake off chips of brick. I believe that I have about 95l% of the bad material cleaned off but before I repaint do I need to coat the area with some kind of a sealer? If so, what product?
Thanks for any help you may be able to offer.