I would wait until after before densifying because the densifier will also make the grout harder. Use a joint filler to fill the lines. MM-80 or something along that line.

On Fri, Nov 18, 2011 at 8:48 PM, <stephen@newlifemarblerestoration.com> wrote:
Hey all, I just ground a small concrete slab and wanted to know if I can densify before the contractor grouts the cut lines or after. Also what do you think about him using epoxy grout for concete?
Thank you

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Walter Nartowicz
Mid Atlantic Stone Solutions
4607 Fayetteville Road
Raleigh, NC 27603
919-772-2155 (Main Office)