Shieldwall Blue vs Arctic Blue

How close are they?

ΔE 7.4, close: similar, with a visible difference side by side. Arctic Blue is a little lighter, warmer than Shieldwall Blue.

Can I use Arctic Blue instead of Shieldwall Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Arctic Blue is a little lighter, warmer than Shieldwall Blue.

Can I use Shieldwall Blue instead of Arctic Blue?

The same difference applies the other way round: Shieldwall Blue is a little darker, 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.