Yeah, "used properly". If you have to come on a forum and ask, you don't understand what you're doing or know how to use it properly.
I've seen broken rings, pistons, etc because of starting fluid use.
Spraying a highly flammable liquid on a piece of steel that is glowing orange from heat will cause that liquid to combust.
Spraying starting fluid into the air filter means the fluid has to travel through the filter, past the turbo, through the intercooler and all it's piping and then into the intake. That's where the grid heater is at, so when it hits the cherry red grid heater and lights off, it burns the fluid all the way back to the can.
That's a lot of fluid in a contained environment. There's a reason most manufacturers put a big label near the air cleaner saying not to use liquid starting aids.
But wtf do they or I know for that matter.
Unless the engine was designed to be used with ether injection, it shouldn't need ether.
I've changed countless pumps, and injectors requiring both the fuel and oil systems to require complete priming. Not once have I needed to use ether to do it.