You may want to source a different coolant. According to The National Institute for Occupational Safety and Health (NIOSH), IPA has a flash point of 53 F CDC - NIOSH Pocket Guide to Chemical Hazards - Isopropyl alcohol.
I’ve used NAPA Cutting and Grinding Oil https://www.napaonline.com/en/p/WLD7651526 for milling aluminum with great success. It’s available in other sizes than that shown in the link.
I hope this helps.
Eric