I read with interest your discussion on end-grain flooring, grouted with a sawdust/Watco mixture (FHB168). My daughter recently purchased a condo which sports extensive oakwood parquet flooring throughout. As a ground-floor unit, the 70’s parquet is adhered to a cement sub-floor. Although the wood flooring is in relatively good condition, it is suffering from shrinkage, leaving random gaps. Does anyone think that this sawdust grout might be a workable solution to filling those gaps? If so, I assume the floor needs to be sanded first, then grouted. Any other budget-minded, gap-filling ideas?