Crusted Sore vs Hull Red

How close are they?

ΔE 8.5, close: similar, with a visible difference side by side. Hull Red is more muted, warmer than Crusted Sore.

Can I use Hull Red instead of Crusted Sore?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Hull Red is more muted, warmer than Crusted Sore.

Can I use Crusted Sore instead of Hull Red?

The same difference applies the other way round: Crusted Sore 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.