Incredible work! That is really stunning.
Originally Posted by Raf
I covered it with a compaktuna(/flevopol)-and peat-mixture. I finished with sealant and peat.
Could you provide a few more details about this? Did you make a mix of compaktuna/flevopol and peat or did you first coat with compaktuna and sprinkle with peat? Were you mixing in concrete as well or was it just the compaktuna?