1057/51 GREY from Cromax are two high productivity surfacers. They can be sanded easily, after one hour of air drying. They dry very well, particularly under IR light. 1051R and 1057R provide a high-quality appearance with no edge mapping.
5:1 With 256S Activator Hardener /Activator (200ml)
or
7:1 with XK203 OR AR7305 Hardener /Activator (140ml)