Sculptamold, Hydrocal, Plaster of Paris?

Can someone give a brief explanation as to when you would use these? I am about to embark on my first layout and I need some advice. From what I can tell, sculptamold is used mostly for terrain

This white nontoxic cellulosebased compound combines the best features of clay plaster and papier mch Sculptamold is lightweight like papier mch but

Amaco Sculptamold

Scenery Basics Using Plaster of Paris - Model Railroading For Beginners Ep 25

Plaster of Paris,Hydrocal,Sculptamoldwich is best?, Page 2

Sculptamold incorporates the best features of clay, plaster and papier mâché. In dry form, this white, non-toxic compound is quickly prepared by adding water. It clings to almost all clean surfaces, including glass, and does not shrink, so it may be applied to an armature or core without cracking. It sets in 30 minutes and may be carved, sanded or sawed when dry. Finished pieces are very light-weight, strong and durable.

Sculptamold 3 lb

Accepts liquid or crystal pigment colors and stains

Hydrocal Plaster for Scenery, Dioramas, Dentistry and Mold Casting 25 lb Bulk Pack Bag - Great for Model Railroads by Capital Ceramics

Casting & Moldmaking @ Raw Materials Art Supplies

Sculptamold

Seeking advice - plaster of Paris vs Scluptamold vs “Green Stuff” : r/TerrainBuilding

Buy Hydrocal, Latex & Plaster Casting & Molding Material by Sculpture House

Hydrocal White Available in the US and Canada - Reynolds Advanced Materials

Plaster of Paris or Hydrocal, Page 2

Plaster of Paris,Hydrocal,Sculptamoldwich is best?, Page 2

Sold as 2/Packs. Dry, non-toxic compound. Does not shrink, and is durable for dioramas. Sets in 30 minutes.

AMACO Sculptamold Modeling Compound, White, 3 lbs. Per Bag, 2 Bags (AMA41821C-2)

SculptaMold plaster mache blending compound

Seeking advice - plaster of Paris vs Scluptamold vs “Green Stuff” : r/TerrainBuilding