Gulfstream Park will have a Rainbow 6 carryover of $4,341,678 on Friday.
The ten-race card has a first post of 12:35 p.m. The Rainbow 6 starts on the fifth race, with scheduled post of 2;35 p.m.
Friday will be the final day before Saturday's mandatory payout of the day's pool and full carryover--no matter the number of winning tickets.
The carryover is second largest in Rainbow 6 history, trailing one that reached almost $6.4 million in May 2014.
It keeps growing because Thursday was the 51st straight day without the jackpot-hitting requirement of just one ticket with the winners of all six Rainbow 6 races.
On Thursday there were multiple tickets with the winning horses in all six races. Each paid $13,248.
The Rainbow 6 is a 20-cent only per combination bet.