Grouting Process for Mechanically Polished Concrete

Water Based Sealers – Pro Polish 770 Grout Binder

Grouting your polished concrete is usually a tough gig. To really get a great polished concrete surface finish, you need to grout the slab. People do grouting many different ways. When I polished concrete the following process usually results in a smooth finish.

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  • grind the surface to the desired finish (salt and pepper or full stone exposure)
  • Finish with an 80 grit cut finish
  • Some people spray densifier before grouting
  • Mix Pro Polish 770 at 4 parts water: 1 part concentrate
  • Make sure the surface is nice and wet before pouring your binder and brooming evenly around.
  • You need to run your machine over the surface to create a paste from the binder and the concrete dust, this will be massaged into the surface
  • Once the paste is thick and creamy and you have full coverage you can then scrape off the excess grout
  • If the concrete is really porous, you may need to repeat the process.
  • Let the surface dry and then cut the surface back with 50 to 100 grit ceramic style diamond pucks.
  • Once all the topical grout is removed and the floor is clean and blemish free, apply your densifier and start the polishing process

Polished Concrete Sealer – Burnished Cream Finish

Sealing Polished Concrete with Pro Seal 896 or Pro Seal 898

Cream finish, polished concrete is a very inexpensive process compared to a high gloss, full stone exposure mechanical polished concrete.

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Specifications for Polished Concrete Mix

  • Minimum 32 Mpa Concrete
  • Preferably use a topping slab on top of the structural slab, if using expensive colours and stone blends from concrete companies this will save you heaps
  • Vibrate well and evenly always
  • Helicopter the surface well to compact cement and fines, this is called burnishing
  • Make sure you have a very experienced concreter finishing your surface
  • Densify the surface as soon as possible, I use a potassium silicate densifiers from Con-treat

Preparation for Polished Concrete Sealer

  • Diamond grind or burnish to a 200 grit finish without breaking through the surface to stone
  • Vacuum all dust from the floor
  • Wet the surface and wipe clean with wet microfibre flat mops

Polished Concrete Sealing with Pro Seal 896

  • Spray apply Pro Seal 896 at 4 parts water to 1 part concentrate
  • Using a microfibre flat mop, spread the Pro Seal 896 evenly over the floor and then cross wipe to be sure you have an even coat
  • Repeat a second coat in approx 2 hours
  • For higher gloss finishes, high speed burnish with a hog hair buffing pad within 24 hours, usually do the next day after sealing the concrete.