Water stains through paint on brick fireplace
We had our contractor tear off a drywall fireplace surround that was coming apart. The bricks underneath were damp, which was expected since the previous owner had a lot of ice damming that wasn't taken care of because she was ill. Since living in the house and being alerted to the damming by our next door neighbor, we were able to stave off any major damming and had no additional water over the past 3 years.
The contractors ran heaters and fixed some of the mortar and when the bricks were dry, they painted with a masonry sealer and then BM paint. They started to see some stains come through, so they did use Kilz, as well. However, after 2 coats of kilz and 2 coats of the interior paint, the staining is not any better, in fact it has gotten worse as of today.
Is there anything that can be done at this point? Any additional product to try? The fp is painted white...if we went with a darker color, would it hide the stains or would they show up no matter what?
Our contractors are aware of the issue and we haven't yet discussed what the fix will be. I just want to gather some other opinions or btdt suggestions before hearing their thoughts.
Thanks in advance!