I'm fitting a mirror in my bathroom which, due to the lights built into it, is designed to be recessed into the wall. So, by Aldi Fein-alike and SDS, I'm cutting out a wide shallow space in the wall. Most of the depth is taken up by tile and plaster, but I am taking off a very thin layer of the hard concrete block that forms the wall itself.
Does the group think it's worth somehow sealing the face of the block? There shouldn't be any actual splashing water here, but it's a bathroom with a sometimes very humid atmosphere. Or am I worrying about nothing?
Cheers,
Pete