Specifications
Common questions
Everything people ask us about POSCA before they buy.
It draws a 0.9–1.3mm line and is the everyday fine POSCA — enough control for illustration and small lettering, enough coverage to colour in. It is the favourite for journalling and rock painting.
The 3M draws a 0.9–1.3mm line and the 5M a 1.8–2.5mm line. The 3M is better for detail and small work; the 5M covers ground faster and comes in the most colours. Most people end up owning both.
Yes. The PC-3M nib is reversible — a bullet at one end and a chisel edge at the other — and it pulls out with tweezers when it wears. Replacement nibs cost a fraction of a new pen.
Wash and dry the rock first, because dust stops paint sticking. The 3M handles most rock painting, with a PC-1MR for faces and fine detail. Seal anything that will live outside in the garden.
Let it dry fully — 24 hours is safest — then spray a clear acrylic varnish in several light passes from about 30cm rather than one heavy coat, which can reactivate water-based paint and smear it. Always test on a scrap done in the same colours first.






