A similar discussion is happening on a ‘Projects’ thread. I thought you might find crashaffinty’s post about milling his material while it’s submerged interesting.
I don’t have any experience milling aluminum, but I’m enjoying all the conversations and different ideas around the subject.
I have to agree regarding looking for a different solution, unless you have exceptional ventilation. My first career was in commercial print and ‘back in the day’ we used IPA to (believe it or not) ‘harden’ the water that we used to wet the printing plates. IIRC the higher the percentage of IPA in the water the ‘wetter’ the plates ran, and was adjusted on a job by job basis. I can say without a doubt, working in a small shop with no OSHA oversight that it was a hell of a environment when we ran 2-color 40” press anywhere north of about 5%. It was miserable running that press during the winter when we couldn’t open the bays. You know, unless your into that kinda thing, LOL.