My prefered process is:
1. Paint all primary colors and details.
2. Seal model with Future.
3. Apply decals and setting solutions.
4. Seal decals with Future.
5. Apply weathering and paint chipping.
6. Apply dull coat sealant.
7. Remove masks from clear parts.
8. Apply any pastel chalks
Check my website for more details about Future and Weathering Basics.