The stuff says "do not apply in direct sunlight or to a hot surface" . . .
I don't worry about the sun. Problem, for most waxes, is that a wax too dry does not polish properly and does not do the required protection.
Just did waxing a few days ago. Generally, wax it in the late summer or early fall. That wax is still good in March as long as one is does not make the always bad mistake of going to a car wash.
Don't know about Honda's wax. But with better stuff (not the liquid stuff or Turtle wax), I do this. First apply wax with much arm power. Scrub it in and spread it widely. After enough time, stop applying wax. Go back to remove the now mostly dry wax. That cleans the finish and leaves valleys in the paint waxed.
Then go back to apply a second coat thinly and lightly. When dry, polish that application without pressure. If the wax does not brush off, then wait for it to dry more. Eventually the best wax finish will be so smooth that a wax can will slide off the hood.
A hot sun and too much time between application and polishing means the wax does not apply properly. Polishing must be done when it first dries and has not yet started hardening.
A good wax may take even days to fully harden - I believe from experience.
Do not apply wax when the evening dew starts forming. Moisture compromises waxing.
Taking it to a car wash simply removes all waxing. Car washes are a worst solution. But great when you want to remove all protection. And even better in Northern states when you want to make salt induced rusting to happen faster.
Sun only means the time between application and polishing is less.