Just catching up with this thread George, good work so far.
Just going back to your priming issues, one option would be to prime everything in black, then just hit the center of panels with white before your top colour. This would give a similar result to the one you were trying to achieve without having to spray thin panel lines.
Just going back to your priming issues, one option would be to prime everything in black, then just hit the center of panels with white before your top colour. This would give a similar result to the one you were trying to achieve without having to spray thin panel lines.

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