I have drywall walls with a plaster veneer. I can see two layers of plaster. There is a thick grey coating on the drywall, then a slightly thinner layer of white plaster on top of that. The white layer has a significant amount of sand mixed in...and the walls are therefore textured. I removed the soffits in my kitchen, so I had to re-drywall. Now, I need to bring the level of the new drywall up to the existing walls, which means going over them with plaster. What sand do I need, and how much do I mix in with the plaster? How do I apply it? The final finish should be as close as possible to the original work. I can take a photo or two tonight if that will help! Thanks!