We have and exposed interior brick wall. It's probably over 100 years old. A few of the bricks are disintegrating, melting, flaking. I'm not quite sure what to call it but there is brick dust all over the floor. is there a sealer that can be used to halt this disintegrating?
Aqua Mix makes some good products. Check their site and they even have tech support via the telephone
Be forwarned though. No good product is cheap. I've used their products with outstanding results and prices to match.