I've always hand-painted my Gundam Artifacts, but I tried painting the whole thing with acrylic markers this time.
My impression? The opacity is insane! Σ( ꒪□꒪)‼
The marker tip couldn't reach the finer details of the Artifact, but I was able to quickly paint the shield and shoulders!
It seems good for partial painting of HG/RG/MG kits too.
The downside is that finding the exact color you want is incredibly difficult. 😓

Alri Marker full paint job | コバーン's Gunpla works