Hi Jimothy, Nice job. I make rock landscapes too but use cement Fondue over various frames made with chicken wire and net curtains, which I really enjoy. I always put a minimum of five coats (both sides) of cement on, sometimes more depending upon shape, to prevent cracking and breakages due to the weather. Once finished they get left outside to weather (usually throughout the winter) which washes any residue from them. I haven’t used polystyrene as I read that there is quite a difference in the expansion and contraction of each material. Plus condensation occurs under the cement. Just something to watch out for and definitely not poo pooing what you’ve done. Do keep us updated when planted up. Great Job!
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