Shining Silver vs Gun Chrome

How close are they?

ΔE 9.4, close: similar, with a visible difference side by side. Gun Chrome is a little darker, more saturated than Shining Silver.

Can I use Gun Chrome instead of Shining Silver?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Gun Chrome is a little darker, more saturated than Shining Silver.

Can I use Shining Silver instead of Gun Chrome?

The same difference applies the other way round: Shining Silver is a little lighter, more muted.

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.