Mike Michaelis talks about the best choice of fillers for seamless flooring systems.

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  • Mike Michaelis talks about the best choice of fillers for seamless flooring systems.

Pros and Cons of Using White Aluminum Oxide:

  • Extreme Hardness and Durability- Best you can get in a clear/white filler (Moh Hardness 9)
  • Wide Range of Particle Size Availability
  • Color Transparency- Will take on the color of whatever system it is in
  • High Cost versus Silica Fillers @ approximately $22 per gallon

Pros and Cons of Using Silica:

  • Good Hardness and Durability- Good enough for most all systems (Moh Hardness=7)
  • Wide Range of Particle Size Availability
  • Color Translucency- Will take on the color of whatever system it is in, but not crystal clear
  • Lowest cost filler @ approximately $3 per gallon
  • Contains Silica, must have warning labels as it can be liberated upon sanding 

Pros and Cons of Using Polypropylene/Polywax (Barefoot) or Clear Cut Plastic

  • Low Hardness, Softer Feel on Bare Feet (Moh Hardness=3)
  • Limited Size Ranges
  • Limited Durability- Will be quickly degraded by snow shoveling, car traffic, or heavy foot traffic
  • Color Translucency- Will take on the color of whatever system it is in, but not crystal clear
  • Highest Cost Filler @ approximately $42 per gallon
  • Can be pre-mixed with any coating, then applied with a squeegee or roller without too much settling out of the system.  
  • Can be pre-mixed with clear, one component coatings and applied with pump sprayers if needed (Barefoot #50 only).  Great for paver sealers.  

In summary, if you want the best, use Aluminum Oxide or a combination of Aluminum Oxide and Silica.  If you want a softer feel or have limits with your application equipment, you will have to go to the Barefoot or Clear-Cut, but it probably won’t save you money unless you use much less of it.