Has anyone on here used Alumasc polymer?? got an estimate for re-roughcasting and the guy said he prefered to use this stuff as it sets like concrete, also how many coats should it have as he has only one on the estimate, is he cutting corners?? There is a gap between the windows at the top and bottom of the house where there is like tongue and groove pvc panels which i want filled in and roughcast, should these be insulated before its roughcast, or just fix wire mesh on the panels and then roughcast over them,all reply's welcome thanks