A fouling release coating composition free of tin compounds comprising:
(a) a polysiloxane-based binder system comprising at least one curable polysiloxane-based binder A having a weight average Mw of 50,000 g/mol or less, such as 8,000 to 50,000 g/mol and wherein binder A constitutes at least 27 wt.% of the total polysiloxane-based binder system;
(b) at least one low molecular weight amidine or low molecular weight amine compound.
Artificial stone having excellent mechanical and weatherability properties is prepared from a highly filled crosslinkable organosilicon composition where the filler comprises at least 20 weight percent of coarse fillers, the organosilicon component contains silicon-bonded alkoxy and or hydroxyl groups, with a catalyst containing a metal compound and an amidine or guanidine.
Artificial stone having excellent mechanical and weatherability properties is prepared from a highly filled crosslinkable organosilicon composition where the filler comprises at least 20 weight percent of coarse fillers, the organosilicon component contains silicon-bonded alkoxy and or hydroxyl groups, with a catalyst containing a metal compound and an amidine or guanidine.