Have a small Cob building. I've lyme plastered the walls. With 5 or 6 layers. Very pleased with the results. Looks great and an all white finish. But the surface is fragile. Dings extremely easily. Anyone know what I can do to toughen the surface ? Like the white walls. But willing to change the color if a harder surface is achieved.
I find mixing some wood ash with lime plaster helps it cure faster and harder than plain lime on its own. Keeping it damp while it sets up is important, too. If you can cover it with some muslin or old sheets and mist it a couple of times a day you'll get a much better carbonate reaction and that's what provides the hard skin.
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