Is it possible to apply only one coat of interior lime finish? Yes,
As so many email me to say! Hey! I can’t find the “Diamond Lime Plaster,”
Diamond is simply a name like “Imperial” both of these lime plasters are made by USG.
If you can’t find Diamond, so what. Buy another lime plaster.
USG’s calls their Lime plaster “Diamond,” one has to admit it’s a clever name for lime plaster,
Why? Diamonds are minerals composed of pure carbon. It is the hardest naturally occurring substance known. Damned clever lime naming if you asked me?
Google, “Lime Plaster sold in my area,”
FYI, it can be named “XYZ or Blaw, Blaw, Blaw, Lime Plaster,” as long as it’s a “Lime Plaster,” you’re good.
This video answered a question often asked on this channel: Can I apply a finished coat?
The fact is, naturally if one applies a basecoat with either structo-lite or any of the base coat lime plasters, it will no doubt be stronger.
In this video, the homeowner left the strong wood cedar lath on the attached sheetrock so that any more strength would have been overkill. Besides, I had an ulterior reason for just a finish coat in some areas. The sheetrock was bulging past the existing walls, so to add basecoat plus a finish would have created a hump and have been an apprentice move for me.
However, you should know how, why, and when not to apply a base coat.
Are these secrets? Not quite; most journeymen plasterers know this fact or should.
The issues usually occur with DIYers or apprentices and even, yes, some veteran plasterers who don’t understand these so-called rules.
Allow me to explain how to avoid blistering and separations from the sheetrock.
If you’re NOT going to apply a base coat and want to trowel on a single finish coat.
Apply the finish coat with as few troweling strokes as possible.
Okay, you’re troweled on the finish coat is applied, one-sixteenth of an inch like the bag says? LOL, here’s a reality check. I have often applied finish coats up to an inch thick, but you should understand when it’s advantageous to do so. Unfortunately, that’s not what this video is about.
Okay, you have your finish on; remember, the thickness means nothing to the next stage.
You wait until your finished coat is almost set.
It will slowly start to darken.
“Again, and this is the key! Use a few strokes to finish it off to your liking and keep your trowel wet.”
Why only a few strokes with a trowel?
Because excessive troweling can pull or detach your new troweled-on finish coat from the sheetrock, especially if your trowel is not continuously wet.
A dry trowel would be like a suction cup and pull or lift your new finish coat from the sheetrock.
I’m not advocating for you folks to start skipping the base coat, as the base coat adds strength as it has sand in it.
I’m mealy answering an age-old and often asked question, Why can’t I apply a single lime finish coat?
So you might ask, what’s the use of a base coat?
If applied first and allowed to set securely to the, let’s say, sheetrock when a finish coat is applied over it, this creates what’s known as a professional plastering mechanical bond that holds your finish coat much tighter than just laying it on sheetrock. And adds strength.
You also should know to wet, soak or mist that basecoat so that the suction is under control.
If you don’t, whichever finish plaster you apply will instantly have the moister sucked from it by that thirsty basecoat.
Now you Know.
There are exceptions where a base coat is unnecessary and or foolish.
As in this video; https://youtu.be/eYazlJ6B8Kw one coat lime plaster.
We were going over exterior stucco that was now used as an interior enclosure.
Why would stucco walls need additional strength?
Why apply Lime anyway? To begin with, earthen plasters can actually improve your health. They are entirely non-toxic, contain no VOCs (volatile organic compounds), and clay and lime even resist mold growth. In addition, an often overlooked and subtle benefit of clay is that when it comes into contact with water, it emits a negative charge.
What the heck is lime? It is made by heating limestone (calcium carbonate) into quicklime (calcium oxide).
It is then re-hydrated to form slaked lime (calcium hydroxide), and the resulting putty is the base for lime plaster.
Once the plaster has been applied, it goes through a chemical process when it comes into contact with carbon dioxide in the air and gradually turns back into calcium carbonate (limestone).
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