Carlo...
I have learned so much from watching your Sudan buildings come to life...I have always been impressed with the precision and exactness to the cutting and building that you exhibit in your displays...the blockhouse roof you mailed me is so perfect...it fits perfectly on my JJD blockhouse...it looks like a machine made it...you are a very accomplished modeler...
it's great to share ideas...as we both learn from each other...it seems that Italy and the USA use different builing materials...
stucco patch is primarily used for decoratively finishing the exterior of brick or cement walls...once dried...it creates an unbelieveably strong finish...
it dries so hard...it's almost impossible to damage the exterior of a small Sudan building done in stucco...and fortifies the entire structure against damage...
I'm sure it's sold in Italy...but don't know what stucco is called in Italian...but I'm sure any contracter could tell you what stucco patch is...
here's a video that might show it's application
http://www.thisoldhouse.com/toh/video/0,,20046341,00.html
the blue board and the pink board is actually called "industrial sheathing"...it's used primarily as insulation inside your walls here...it usually comes in 4x8 foot sheets...about $9.00 a sheet...perhaps a contracter could help you find some...it's a really great product and very strong...it won't crumble or chip easily...it's very popular with hobbyist in the USA...
your results are so nice...I wouldn't change any of your products...I love the smooth creamy finish you are getting with your spackle...the look is very realistic to the Sudan climate I think...I only wanted to make you aware of other products...but perhaps they are not available to you...
you're good enough to be your own building inspector...you're such a perfectionist I know they will pass code...
thanks for the reply and tips...