In process of installing stone veneer on my fireplace. The scratch coat went on just fine over the metal veneer and it's looking good.
When I scratched the mortar, some crumbly bits (pea-sized and smaller) rose then clung to the lips of the scratches/trenches. Mostly they knock off pretty easy, and I'm intuiting that I want to remove the looser bits before installing the stone veneer.
My question: how much pressure should I apply to remove these bits, and with what? I tested an area with brisk attack of a straw kitchen broom, and many bit fell off, but many remained that seemed pretty loosely connected.
I want to use a wire brush, but I'm worried that I'll take the micro-edges off the scratch coat's surface and weaken the subsequent mechanical bond when I install the stone veneer.
So do I knock off the dingle-berries (for lack of a better term)? With what? How aggressively? Thanks for the advice!