I used Vuba Easihold to secure some landscape rocks in a 4 inch channel between cement boards in a driveway. - firm even after 1 coat (I did 2+). But one downside was that I needed MUCH more product than the product specs recommended. Based on the total area in square centimeters (converted to square metres) of a 5 liter drum it should have been enough. But once I started using it - even watering sparingly with a watering can as they recommend - it quickly became clear that even half a bottle wouldn't do for one coat. ordered 3 more bottles which was a bit overkill but it allowed me to apply 2 coats plus a light 3rd coat. I laid a layer of sand first, leaving about 2 inches of depth for the stones. Following your recommendations, I used stones no larger than 10mm, which I felt helped keep them firmly fixed. Maybe I miscalculated, or maybe the depth affected the amount required more than I thought. I'd say buy more than you need, but it's not cheap (although a lot cheaper than similar products I've found from local sellers) and I'm not sure what the return policy/cost is. That's the only thing keeping me from giving 5 stars. I still recommend it as we are very happy with the results.
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