[spdbrake]

Originally Posted by HTM101

Years ago I had to blast the engine compartment of my Cobra with a dry chemical extinguisher and did a great job of putting out the fire. However, the chemical etched every piece of aluminum in the engine bay; inner fender liners, firewall, radiator, everything.

I switched to a Halotron extinguisher.

Yes the Dry chemical is corrosive to aluminum. And hard to clean up. We've had to reskin the entire tail section of a jet as it got between the stringers and skin. It's recommended to never have those types on the hanger floor.
Cleanup instructions: https://www.guardianfireprotection.c...tal%20surfaces.