I didn’t read the copy on the OMP bottle, but I’d assume it’s the same as the Comp Motorsports version, which it says it’s water soluble so it cleans up with a hose. That would be my only reservation, having retardant in every nook and cranny forever.
But I guess it beats the alternative: a pile of melted fiberglass.
eta: Those 4L systems are designed to meet the sanctioning body’s rules and are designed to protect the driver in the the event of a crash where the driver is a) possibly momentarily incapacitated and b) doused in flammable fluids.
From what I’ve seen of race cars, they would take up a sizable bit of real estate in our clown cars. It would be nice to get a 2L system with engine compartment nozzles only. I imaging I could fit a 2L bottle behind my driver or passenger seat. Otherwise wasted space.