I finally started the scenery phase of my layout layout out cardboard strips but tried phite plaster & paper towels. The paper towels weren't strong enough to retain any shape between the strips (3" spread) and the white plaster takes forever to cure. Sooo, I'm off to get paper shopping bags, but need help with finding the right type of hydrocal. Literature says use 'lightweight hydorcal. When I pull up ASG home page they offer at least nine different products. The closest seems to be 'White Hydrocal'. Can anyone help out. The supplier is far off and I need a large quantity so I'm trying to shorten my learning curve. Thanks, Jim