I'm not modding, I'm improving
Keep it moving would be the key to the heat issue. Make sure you check your work after every session and more if you are worried. Touch it with the back of your hand to check.
Also, when correcting paint work you should be doing the whole panel (if doing it panel by panel rather than the whole car), not just particularly bad spots. You will create uneven paint work.
If time is your limitation, find a few hours, clean the car down and process one panel i.e bonnet; wash, dry, clay, wash, dry, polish, protect.