____________ bull floats are less likely to seal the surface.

• A. Plastic
• B. Metal
• C. Wood
• D. Fiberglass

Answer: (C)

Sealing the surface with a bull float depends on how smooth and hard the float’s face is. The goal is to compress the surface cement paste and push bleed water into the slab to create a dense, less permeable top layer. Wood is porous and has a rough, grainy texture that tends to ride over the cream rather than smooth and compress it evenly. That makes it less effective at sealing the surface. In contrast, metal and synthetic floats (plastic or fiberglass) have smoother, harder faces that better polish and compact the surface, producing a tighter seal. So wooden bull floats are less likely to seal the surface.