Shieldwall Blue vs Cursed Blue

How close are they?

ΔE 9.7, close: similar, with a visible difference side by side. Cursed Blue is more muted, warmer than Shieldwall Blue.

Can I use Cursed Blue instead of Shieldwall Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 10). Cursed Blue is more muted, warmer than Shieldwall Blue.

Can I use Shieldwall Blue instead of Cursed Blue?

The same difference applies the other way round: Shieldwall Blue is more saturated, cooler.

ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.