That is not balance if it completely makes Fire and Extinguishers to be disregarded.
How the chemspray works, sure its balanced, but what it does for other items is not.
I dont know why my suggestion would nerf the chemspray because it does not. Theres more time to repair and less time to worry for your chems cycles.
One chem would cover the ship, while another engineer can have an extinguisher as a spare. Currently, we recommend chemspray even to newbies because in the long run getting used to that will benefitt more than the extinguisher. The chemspray isnt imbalanced, its what it does to other things is breaking other items behaviour.
Again, why would you bring extinguisher
Why would you bring Fire weapons / Incendiary
It will be balanced to a point where only very few fire stacks will be applied to the chem sprayed component to the point where it can be extinguished with Chem Spray alone.
The idea was youl have to add more effort if youde want to add more fires. Ofcourse chemspray should still be able to combat fire, but fire will always find a way. Because fire will always find a way in lower precentages, chemspray repairers will be slowed down. While the extinguish repairer wont be. Adding to the argument of having one chem and one extinguisher to be good.
Let me try to explain then once again: A good engie is not only that engie, who know how to run in circles and chemspray. You can teach every noob to do that. If you guys are trying to tell that current chemspray in right hands is imba, then HELL IT IS NOT! You completely don't consider fact that components need to be repaired and rebuilded. When for example main engineer on Goldfish is tanking the hull, because opponents are very fierce on gatling, then he'll have to stay on it and engines will lose chemspray buff. You get it already, or still need more examples?
But then theres no fire weapons hitting you. He lost chem but wheres the threat of fire? Why would you bring extinguisher? If the enemy knows that the ship has chemsprayers, it would be a disadvantage to bring fire weapons or incendiary. The only fire weapon that used in good timing is the flamer, while every other weapon requier chance and luck or recievers fault for fires to come in. Most ships are gattling or pierce heavy because of fire being unreliable. I mean fire doesnt directly kill but rather it is to cause some chaos for the crew on the ship so that it is easier to kill. But it is harder to add that fire. So why not directly kill?