Rock Grey vs IAF Sand

How close are they?

ΔE 5.7, very close: most people won’t see a difference side by side. IAF Sand is a little darker, warmer than Rock Grey.

Can I use IAF Sand instead of Rock Grey?

Yes, for most jobs. Very close match (ΔE 6). IAF Sand is a little darker, warmer than Rock Grey.

Can I use Rock Grey instead of IAF Sand?

The same difference applies the other way round: Rock Grey is a little lighter, 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.