Garage heater?

[swamp rat]

Getting tired of using a 1500 watt space heater in the garage that barley heats a 7' area in my garage, i do plan on stringing up a temporary paint booth made out of plastic so I'm looking for a heater that's safe to use regardless of if I'm painting or using other chemicals ect.

I have seen propane forced air and propane inferred but didn't know about the safety aspect of using these in a 2 car garage.

Any other electric heaters i could look at?

Want to know what you use.