Semroc Cherokee D Build, Part 6, Primer Coat, Sand And White Color Coat

A few small standard steps won't been covered with pictures this time.
This build was going to concentrate on build time and tips.

BUILD TIME - CA Tube Ends and 24mm Engine Mount Gluing = 5  minutes
BUILD TIME - Mark Tube for Fins, Glue Fins = 15 minutes
BUILD TIME - 2 applications of Titebond M&TG Fin Fillets (not including drying time between fillets) = 12 minutes
BUILD TIME - Launch Lug Mark and Glue = 3 minutes
TOTAL BUILD TIME so far = 3 hour, 5 minutes

TIP: You really don't need four coats of filler/primer and sanding between coats.
I spray one thicker coat and sand with 320 then 400 grit until the tube and surfaces look like the picture at the right. Remove most of the filler with 320 grit. If you sand down to the white tube while using the 320 grit you've probably taken too much primer off. Follow with the 400 grit until you get that "patchy" look.

BUILD TIME - Primer Spray (not including drying time) = 5  minutes
BUILD TIME - Sand Primer, 320 then 400 grit = 20  minutes
BUILD TIME - First White Coat = 5  minutes

I can't sand until the white coat dries, at least 24 hours in the Florida humidity.

TIP: After you spray the first white undercoat, hold the model up to a bright light and look close at all the surfaces.
Sand over any rough spots. Wet sand only after the first color coat. Don't wet sand on bare tube or bare wood. Bare surfaces will soak up any water used in wet sanding and swell up! Only wet sand over sealed surfaces.

Wet sand (actually more like damp sanding) after color coats with 400 grit.
After the next color coat is applied, all those rough areas should disappear. You should have a good gloss surface overall.

As always - these are the methods that work for me. 
Your methods (and finished results) probably work best for you!

TOTAL BUILD TIME so far = 3 hours, 35 minutes