[chris vickery]

Hi Jes

It's up to you but if you are painting outside, you could opt to use a full face respirator, non air supplied. It may get hot or even steam up but it is an option if you do not want to go the full route of air supplied equipment.
With air supplied equipment you will need a supply of breathing grade air as well, not just simply tapped into an ordinary airline. So this means use of a compressed air system with the correct filters and humidifier or use of breathing grade compressed gas from bottles. The full face respirator doe offer protection to the eyes and skin on the face vs the half mask. Many of todays paints can be nasty depending on what they are. I think if you are using ordinary alkyd enamel you'd be OK with a half mask.
Check around and ask lots of questions.
Personally when I paint outdoors I use the half mask and safety googles.