RAF Medium Sea Grey BS381C/637 vs BS Med. Sea Grey

How close are they?

ΔE 4.0, very close: most people won’t see a difference side by side. BS Med. Sea Grey is a little darker than RAF Medium Sea Grey BS381C/637.

✓ AK 3rd Generation equivalence chart lists these two as equivalents.

Can I use BS Med. Sea Grey instead of RAF Medium Sea Grey BS381C/637?

Yes, for most jobs. Very close match (ΔE 4). BS Med. Sea Grey is a little darker than RAF Medium Sea Grey BS381C/637.

Can I use RAF Medium Sea Grey BS381C/637 instead of BS Med. Sea Grey?

The same difference applies the other way round: RAF Medium Sea Grey BS381C/637 is a little lighter.

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.