This is my first post, so please be gentle
I just finished making my first plaster wedging table, and I'm experiencing something odd. No matter how much I sand, scrape, and clean the surface, little specks of plaster are contaminating my clay as soon as it hits. I've attached a photo. As far as I can tell, I followed the instructions for mixing the #1 pottery plaster. I also vibrated the mold to remove bubbles, and I've waited several weeks for it to fully dry. Has anyone ever had this problem? I know I could switch to another surface material, but I've always preferred how the clay moves on plaster, and I cherish it's quick-drying qualities. Any help would be greatly appreciated!