Details
Hard Trowel: The cast-in-place standard: great for pre-cast too. Mold is right side up. Surface can be ground heavily, lightly or not at all to reveal varying amounts of aggregate: pea gravel is recommended. You can use vibration.
Pressed: Must be done pre-cast. Mold is worked upside-down. Creates Buddy's signature veined look. Some polishing required. Do not use pea gravel with this technique. No vibration needed.
Question:
How much concrete will each bag produce?
Answer:
Each bag produces 1/2 cubic foot or 4.5 square feet of material at 1 1/2" thickness, without added pea gravel.