Matt Black vs Gloss Seablue FS151042

How close are they?

ΔE 6.7, close: similar, with a visible difference side by side. Gloss Seablue FS151042 is more saturated than Matt Black.

Can I use Gloss Seablue FS151042 instead of Matt Black?

Usually, if you are not matching paint already on the model. Close match (ΔE 7). Gloss Seablue FS151042 is more saturated than Matt Black.

Can I use Matt Black instead of Gloss Seablue FS151042?

The same difference applies the other way round: Matt Black is 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.