If you were not sure, the underlayment for the seed should have been activated charcoal. Pendimethalin or Prodiamine work the same on all grass seed be it fescue or crabgrass. Charcoal will neutralize herbicides in the soil.
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
Benjamin Franklin 1775
Sell not virtue to purchase wealth, nor Liberty to purchase power.
Benjamin Franklin Poor Richard's Almanac1738