What happens when the BlazeCut retardant hits air/fire? If it’s like standard fire extinguisher retardant, I would say it probably wouldn’t be effective. OTOH, if it reacts anything like 2 part foam, which expands to something like 1,000 times it’s original volume, I could see that little tube easily filling an engine compartment with foam and extinguishing a fire. Might require a complete rebuild afterwards, but so do most onboard halon systems afaik.
Put me in the “Agreed Value Policy is my fire extinguisher” camp.