I want to patch interior plaster on a brick wall. The original is hard as nails, really tough to sand (by hand, anyway). It is also very fine grain and smooth. I went to the building supply place and was handed a bag of "patching plaster" (50 lbs). It is labeled "for interior use only".
After applying it, I find that it is much softer than the original plaster, and not as smooth.
What is the original plaster called, and where can I get it? Is this a specialty of bricklayers, or something? I've been to two other supply places and no one has anything but the same soft "patching plaster".
Thanks,