2 K urethane high build

ir3333 said
are different 2K urethane primers compatible if used long after original coating has cured?
How long do you guys wait to block after priming?

If the first 2k primer has cured then there should be no issue in using a second brand over it.

For sanding I would wait at least 24 hrs after spraying or follow the recommendation of the paint company that made it.