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natural hydraulic lime restoration - indoors


JFC1

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I'm hoping that someone has experience plastering indoors with natural hydraulic lime? I've only used it outdoors and with brick and stonework, with great results, but now I'm trying to restore two beaten-up rooms with 19th C. plaster walls, and to use NHL rather than something like USG's gypsum-based plaster veneer finishes for the top coats. So I'll need to skim coat an existing old NHL shiny plaster wall stripped of its modern paint, fill in a series of cracks and bulges on walls an ceiling, and then do one 18' x 11' high wall that has nothing but lath at this point.

My specific question involves whether or not anyone has tried to use Structolite or USG's basecoat for the first and second layers to attach to lath and then smooth out, and then put an NHL over that? Can the cheaper and easier to work with basecoat stand up to an NHL topcoat or does the NHL suck the moisture out/interact poorly with the non-NHL base? 

I've scoured the internet and talked to the specialty suppliers, which reveals those who do it in the standard modern structolite/USG veneer finish way or some old school artisanal way that costs $$. I'm trying to innovate and cut costs and make it work with the skills I have. 

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2 hours ago, electric10162 said:

I think @Greybeard can probably lead you in the right direction.

I've only used durabond or similar product and regular usg or plus3 spackling compound.  Never ran into a job needing plaster applications down to the lathe.  Full time spackler may know.  I've fixed cracks in plaster by gauging out the cracks, applying mesh tape, and 2 coats of durabond 90.  Came out perfect and held up when many years later I removed the wallcovering and painted same walls.  Could be a bitch to match if it has a stucco pattern to it and not smooth.  

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On 8/3/2022 at 1:03 PM, Greybeard said:

I've only used durabond or similar product and regular usg or plus3 spackling compound.  Never ran into a job needing plaster applications down to the lathe.  Full time spackler may know.  I've fixed cracks in plaster by gauging out the cracks, applying mesh tape, and 2 coats of durabond 90.  Came out perfect and held up when many years later I removed the wallcovering and painted same walls.  Could be a bitch to match if it has a stucco pattern to it and not smooth.  

Thanks, that's a help.  I'm torn between the durabond/spackling method, which is a gypsum plaster I think, and trying an entire wall 10' high for the first time with nothing but 3 coats old school lime...I can do the gypsum, but not sure I can get the lime smooth on the first try and if that's the case it's bust it back out! 

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