When you say that the paint is not fully dry, did it eventually dry properly ?
From experience with Phoenix paints, they can take quite a while to mix properly, maybe twenty minutes or more.
Perhaps try mixing the paint again and test it on a piece of primed material and see if the colour changes to that on your wagon.
The large tins are the worst, you can end up with arm ache by the time it is fully mixed and dries correctly.
All the best
Ray