Which Triad is it ? I am in a similar situation and am a slave to Reaper's triadsReaper has a Sky Blue that's pretty nice. It's part of a triad with two darker blues. Use white to lighten. You could tone the base SD down some with a bit of their Misty Gray. Worked for me on a 30mm ACW flat.
Cheers,
Glen
Which Triad is it ? I am in a similar situation and am a slave to Reaper's triads
ThanksSapphire, True, and Sky Blue triad. #s 09016, 09017, and 09018.
Reaper's color chart for their Master Series Paints: http://www.reapermini.com/Paints/corecolors
Slainte,
Glen