Wyldwood vs Demonic Skin

How close are they?

ΔE 20.3, loose: different enough that you should pick on purpose. Demonic Skin is noticeably lighter, more saturated, cooler than Wyldwood.

Can I use Demonic Skin instead of Wyldwood?

Not as a straight swap; see the closer alternatives below. Loose match (ΔE 20). Demonic Skin is noticeably lighter, more saturated, cooler than Wyldwood.

Can I use Wyldwood instead of Demonic Skin?

The same difference applies the other way round: Wyldwood is noticeably darker, more muted, warmer.

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.