Moon Puppy,
Yes, I think I may have been confusing a bit, I apologize if I did. It is the stuff to seal wood against water and while I used it to act like a clear coat on my 1/35 scale model dioramas on the frames I build for them.
As I mentioned I experiment a lot with home improvement products and caulking in a tube works well for building up ground on a dio...I use a mix of this to cover foam bases for the RR and any dioramas, heck it's the same thing, just that the RR diorama is abunch of smaller dioramas tied together.
1.) Mix; tan latex paint, tan colored caulking, and water into a batter like waffle batter.
2.) Spread over a foam base an old paintbrush, the blue or pink foam works good, florists green foam that is used for fake plants comes in 3 "bricks' to a package and works great and is cheap! As this mess is drying sprinkle on sifted dirt, sand or other "ground soil" and let the whole thing dry over night. As with the acrylic "water" each layer should take about 2-3 hours to set up for the next layer and by the next day be rock solid.
3.) I built a 1/35 scale dio depicting a beach landing of Army Rangers in WW2 with an amphibious DUKW as the vehicle, the beach and water effects were so realistic my wife almost got seasick. I built up the beach using the green florists foam, the soft kind and after applying the goop mix sprinkled fine grain sand on it. The water was built up with a mix of blue acrylic paints mixed with caulking and set up to dry. I then spread the acrylic Polycrylic over the water effects and the clear coat started to look very real.
I have posted many subjects on both this and the MRR forum having to do with the advantages of using inexpensive home improvement products, not only are they less expensive for the amount, any product that is acrylic based will most likely mix with another product in that category.
Try the methods I mentioned and if you succeed let me know.
The best,
johncpo (about 50 years of modeling ships, planes, armor and now HO trains.)