You know what ruins a perfectly good wall? A lopsided external corner. One that's bumpy, uneven, like a kid's first attempt at origami. But here's the thing: external corner plastering doesn't have to be a nightmare. Done right, it's the detail that makes a room feel polished, like the cherry on top of a sundae.
Let's start with prep-boring, I know, but crucial. You gotta get that corner straight before you even think about plaster. I use a metal corner bead, nailed in tight. No wiggling, no gaps. If the bead's wonky, the plaster will be too. Take your time here-10 minutes of prep saves an hour of fixing later.
Now, mix your plaster. Not too runny, not too thick-think creamy peanut butter. I've seen guys dump in water like they're making soup, and then wonder why their plaster slides off. Slow and steady, stir it good, let it sit a minute. Trust me, the consistency makes all the difference.
Application? Start with a thin coat. I call it the "base layer." Spread it evenly over the corner bead, pressing just enough to fill in the nooks. Let it dry-really dry, not "I think it's dry" dry. Rushing this step is like putting a band-aid on a wet cut-it won't stick.
Second coat's where the magic happens. This is when you shape the corner, make it crisp. Use a corner trowel (shoutout to those little guys), hold it at a 45-degree angle, and glide. Keep the pressure even-too hard, and you'll scrape off the first coat; too light, and you'll leave ridges. Breathe, take it slow.
Sanding? Go gentle. A fine-grit sandpaper, circular motions. You're not trying to carve marble, just smooth out any tiny bumps. And wear a mask-plaster dust is no one's friend. Once you're done, run your hand over the corner. It should feel like a straight line, no surprises.
The best part? When the paint goes on. That sharp, clean corner catches the light, makes the whole room look taller, neater. Clients notice that stuff-they might not say it, but they'll remember how "put together" the space feels. External corner plastering isn't just about covering a corner-it's about pride in the details.
So don't skip the steps, don't rush the dry time, and for goodness sake, respect the corner. Do it right, and that external corner won't just be a wall edge-it'll be the detail that makes your work stand out.
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