Sprayed Glass Fiber-Reinforced Concrete Countertops

Three: Spraying

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Tools
Step 1 – Spray the Horizontal Surfaces
  • Work from one edge of the form outward.
  • When spraying horizontal surfaces, table vibrators can be turned on to help minimize air bubbles.
  • When spraying corners, first blow any sand particles out of the corner so they aren’t trapped in at the surface.
  • The face coat thickness can be about 1/8″ thick.
Step 2 – Spray the Vertical Surfaces
  • After the horizontal surface is completely sprayed, turn off any table vibrators, and begin spraying the vertical surfaces.
  • Be careful not to build up too much material on the vertical surfaces, or the concrete will slide down, leaving streaks that will show in the finished piece.
  • Spraying the vertical surfaces is like painting – use multiple thin coats, giving the concrete some time to set in between.
Step 3 – Press Concrete Into Edges
  • Use a chip brush to press the concrete into the edges of the form.
  • This will help eliminate any air pockets and ensure the concrete is firmly pressed against the casting surface.
Step 4 – Spray a Final Coat
  • Spray a final coat to build up the total thickness of the piece.
  • After the piece is fully sprayed, begin mixing the structural backer, letting the concrete stiffen up before packing it in by hand.
Previous: Mixing

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Next: Grinding

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