Pretty much all the coatings are instructed not to use in direct sun,how ever I've done it a lot with gloss coat and no promblems.Pinnacle and gloss coat are usable in the sun.mckees tends to be a little streaky and oily.
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Welcome. I do not recommend applying in direct sunlight when it is say 90 degrees and above. However; you can apply Gloss Coat outside with no issues. I have done tons of Gloss Coat, Opti Coat Pro, and CQUartz Classic jobs outside. If its really windy, try and not apply in this condition or try to have your car away from blowing debris. Otherwise, if there is sun, and its generally calm....apply away. GC is super easy to apply honestly.
Wrong. The results will be fine if he follows my above recommendations. But you are right in keeping the work area small as well as keeping sharp eye on flashing and leveling.
Some miseducation here. GC can be polished off with an abrasive polish.
See my responses in bold OP. Best of luck!