Hey, rochie, Andy,
Thank you both so much for the help and guidance. These are the kind of things I need to learn about with moving to acrylics. Great information. I have a largish bottle of Vallejo primer and that will be used on the entire exterior. So far, I am doing the interior. The little bit of hand brushing I have done so far is with Vallejo Model Color, not the Model Air. That seems to brush on nicely, but it does dry out faster than the enamels. The model airs do spray nicely. I have not done as much large area spraying yet, so I am not sure I have run into the drying out issue yet.
Andy, any ideas on the extender? I have poked around a couple of online shops with no luck when looking for Vallejo specific compounds. Are these extenders more "general purpose" (i.e. what works for MM Acrylic would work for Vallejo)?