The action that reduces sealing when using a magnesium bull float is to

The action that reduces sealing when using a magnesium bull float is to

• A. tilt the head up
• B. keep blade flat
• C. press harder
• D. move slowly

Answer: (B)

Keeping the magnesium bull float blade level reduces sealing by spreading the contact pressure evenly across the surface rather than concentrating it at an edge. When the head is tilted upward, the float tends to dig in more at certain points and push surface fines and moisture toward the surface, creating a tighter, seal-like top layer. Pushing harder or moving more slowly also increases compaction and burnish, which enhances sealing. By maintaining a flat blade and using light, broad passes, you minimize this early densification and preserve a more open, workable surface texture.

Keeping the magnesium bull float blade level reduces sealing by spreading the contact pressure evenly across the surface rather than concentrating it at an edge. When the head is tilted upward, the float tends to dig in more at certain points and push surface fines and moisture toward the surface, creating a tighter, seal-like top layer. Pushing harder or moving more slowly also increases compaction and burnish, which enhances sealing. By maintaining a flat blade and using light, broad passes, you minimize this early densification and preserve a more open, workable surface texture.