Short answer: Absolutely! But let's get into the details, 'cause plaster's trickier than regular filler, and you don't wanna mess it up.
First off, plaster's way thicker than that lightweight filler you use for nail holes. It's creamy, dense-like a thick smoothie-and you gotta spread it evenly if you don't want cracks later. A filling knife works here 'cause its flexible blade can handle the thickness without breaking. It lets you smooth the plaster right into gaps or over rough areas, like when you're patching a bigger hole in a plaster wall. I did this in my bathroom a few weeks ago-patched a 2-inch hole with my filling knife, and once it dried, I painted over it. You'd never even guess the hole was there!
But here's the catch: not all filling knives are the same. You need one with a medium blade-4 to 6 inches. Too small, and you'll be spreading plaster in tiny, annoying strokes forever. Too big, and you won't be able to control it. Also, make sure the blade's clean and dry before you start-plaster sticks to dirt like glue, and you don't wanna mix grime into your patch. Pro tip: Dampen the blade a little first. It helps the plaster glide better and keeps it from sticking to the metal.
I've heard people say you need a "plaster knife" (yeah, that's a real thing), but honestly? A good filling knife works perfectly for small to medium plaster jobs. Just take your time-don't rush the spreading, and smooth out the edges as you go. If you're re-plastering an entire wall? Sure, grab a plaster knife. But for patching and small fixes? Your filling knife's more than up to the task.
filling knife from hanke tools
