GIBCO products are the best admixtures on the market, they are a non toxic, organic chemical concentrate, that is safe and convenient to use. One gallon of GIBCO'S product equals a ton of lime. GIBCO'S formula gives a smooth, homogenized texture to cement plaster and masonry mortars for easy workability. The dosage rate for GIBCO'S MRF & PRF is 3 ounces per 94 lbs of Portland Cement Type I or II.