They have a patent on the grout that they sell.......so are of course unwilling to disclose the exact contents......they sell the material at their web site ($60 per gallon)
From the site.......Several points to remember:
Keep the "sawdust" grout lines less than 1/4"..........If they're larger then use tile grout instead........
"they" use the sawdust from cutting the blocks for the grout to match color/species............
They bevel the blocks edges for good clean joints..........
The grout will shrink and need to be re-applied/refreshed in the future...........
If I had to do this .............I would use a good quality oil based floor polyurethane........power blend the sawdust and finish with a drill/mixer to a nearly DRY mix ......and then TEST the result on a workshop prototype to test the drying time and appearence and consistancy...............
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