I don't know if it would work on the material you're using (hypertufa?) but what I do with clay and concrete is take a strip of heavy plastic sheeting and pull it gently back and forth across the wet edge I want to smooth.
Hello Everybody, I am new to Hypertufa. I am going to be watching this forum so I can get some ideas. I watched a video from a link a nursery gave me, but it left a lot of unanswered questions. So even though I have all the stuff I still would like some tips and ideas before I get started. Also if you use a bowl as a mold, when or how do you remove it? Please send pictures of your master pieces and your flops tell me why they flopped so I will not make the same mistakes. Tell me your secret for successful projects. This is the link:
It needs to get dry enough to hold together. Then you want to slow the drying time to give the cement time to cure - whatever that means. Don't know the science but slowing the drying time makes the cement stronger. Slow, damp drying equals strong cement.