Lovely painting Eugene,That insulation foam technique looks interesting!,I have used Acrylic Modelling paste sprinkled with coarse sand while still wet,in the past.However this technique can only be used on a non-flexible mount such as board or wood panel.
Dave

Thanks for the comments! Foam is very difficult to work with. It is very sticky and instantly dries. I have been using foam for aquarium design for many years, and have adapted to working with it. The foam is very durable and light. Shelf life with the standard use of 30-80 years. And the picture hangs at home in ideal conditions, the foam is covered with acrylic and varnish.