I’d recommend a space heater and thermometer for your garage. The epoxy that came with my kit was MAS LV w/ Slow Hardener.
look here for the manufactures FAQ https://masepoxies.com/faq/
Pay close attention to the MAS epoxy cure schedule on the FAQ, they do not recommend using the product in temperatures below 41°F and for every 18°F the temperature falls below 77°F, the pot life will double for the mixture.