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BS 611 mold casting weight is about 12 lbs. - (5.45 kg.)
1x2 cement to filler mix ratio. You can also mix 1-part Portland cement to 3 parts sand (filler), plasticizer and water has to be re-calculated by cement weight
For best result always add dry pigments to your mix prior adding a water. Mix concrete with pigment and additives few minutes, then add water (mix at least 3-5 minutes). You can also add Super plasticizer to the water 10-15 minutes prior casting, then mix with dry ingredients.
Please note: Concrete minimum mixing time 3 minutes with hand mixer and minimum 5 minutes with mortar mixer (it takes few minutes until Super Plasticizer absorbs to cement and start the reaction).
To color different molds sections, brush color over the molds selected sections, then cast the concrete.
Cover the mold with plastic. Remove the stone from the mold in 12-24 hours.