I use Createx Paints for my airbrush and Vallejo Model Color for my paint jobs. Vallejo last very long, I use them for like 10 years and are still satisfied. Don't mismatch them with Game Color from Vallejo. Useful too but not as good as the Model Color ones.
As for sealants I always used Mod Podge Gloss and Matte. Now I use a matte Polyurethane sealer, which is awesome too - Deco Art DuraClear.