Which material bull floats are less likely to seal the surface?

Which material bull floats are less likely to seal the surface?

• A. Wood
• B. Magnesium
• C. Steel
• D. Plastic

Answer: (A)

The surface sealing you get from bull floats depends on the hardness and smoothness of the float’s contact face. A wooden bull float has a softer, porous, and rough surface, so it drags and barely pushes down the laitance, leaving a more open, less sealed texture. In contrast, harder, smoother floats—like magnesium, steel, or even some plastics—press the top layer more effectively, compacting the surface and sealing pores. Because of its softness and porosity, wood is less likely to seal the surface.

The surface sealing you get from bull floats depends on the hardness and smoothness of the float’s contact face. A wooden bull float has a softer, porous, and rough surface, so it drags and barely pushes down the laitance, leaving a more open, less sealed texture. In contrast, harder, smoother floats—like magnesium, steel, or even some plastics—press the top layer more effectively, compacting the surface and sealing pores. Because of its softness and porosity, wood is less likely to seal the surface.