How to Glue Rocks Rock Epoxy and Rock Sculptures
Maurizio Magnani was perplexed after visiting a public park in Duarte, CA. Here's what he wrote me:
"I would like to build a river rocks assembly I saw at a nearby park. See the photo below.
The rocks are bonded together by some kind of bonding material which is placed in the back of the rocks and somewhat hidden from sight so as to give the assembly a dry stack look. I was able to reach with my finger between two stones and felt that the material was very hard and smooth because I could not scratch it.
Do you have an idea as to the kind of bonding material was used? And, by the way it is grey in color if that might help in identify it."
Here's my answer to Maurizio:
Easy! The rocks are bonded together with an epoxy. There are many different epoxies that work well for rocks and masonry.
It appears the viscosity of the epoxy that was used at the park was very high having the consistency of a very thick batter like mortar.
Low viscosity epoxies will flow like maple syrup.