I bought my IR temp gun at a local hobby store, $40 and it is bright orange and looks like a stop watch!!! (Looks cool, and can get into tight places)
I never see coolant temps higher than 195-200F while driving WOT. Park the car for 10 minutes in 110F degree ambient temps after you just ran it, and you'll see temps spike to 210F on startup. But after 5 seconds of idling will bring it back down to 195F.
Do you have an aftermarket temp gauge to monitor while driving? IR gun won't help you there.