What Is a Darby in Concrete?

A darby is a long, flat tool used to smooth in plastering and rendering. It can also be used on concrete floors. It consists of two handles on a flat plate with slightly lipped edges. A darby is similar to a float, except larger.

Why do you use a magnesium float on concrete?

Although they are slightly weaker than their aluminum counterparts, magnesium floats are lighter and are the most popular choice among professionals. Magnesium smooths the surface of fresh concrete and opens the pores for proper evaporation, all without pulling the surface like a wood or resin tool.

Why is it called a bull float?

Bull Floats

This is because these floats consist of a long handle attached to a wood, resin, aluminum or magnesium float. The handle can measure anywhere from 4 feet to 16 feet long.