Ok guys,
My take. Been doing this in the states for almost eight years. Love the product.great finish opportunities for any room. What I usually do is basecoat with a setting type hard joint compound( durabond brown bag), to that in dry mix I add about three quarter gallon structolite plaster. This will stick to most walls and give you a inexpensive leveling and building coat. Also leaves surface rough for first coat loma. Most of the ti e no color added to that coat. From there you could finish with another coat of loma or porcellina or maritino. Sometimes I will only do one coat loma colored coat over the durabond. Also love the porcellina with black Oliver soap into a tightly worked surface. The key is getting all walls right before putting clay on.also like the casin add mix to go over a perfect painted wall. I don't use the mix when going over the durabond, lots of suction there.
Rex