White undercoats are important to bring out the brightness of the color coats to follow. Lighter final colors are a bit transparent - the white underneath makes the colors pop.
The only time you don't need a white undercoat is if the final color is black. The Red Max nosecone is black. I shot it anyway while it was slid in the forward end of the body tube.
I usually do two white undercoats - there is final smooth sanding between and after these two coats of white.
Look close at the picture above to see some gray primer showing after light sanding of some rough areas and glue blobs.
The first picture shows the model after the first white undercoat and light sanding with 800 grit.
This lower picture is after the second white undercoat. More light sanding with 800 grit followed.
With a good, even white undercoat, color coats can be applied.
No tricky mask on this one.
The body and fins are red, the nose cone is sprayed black separately off the body.
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