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Refilling Posca Markers with Water-Based Paint Posca markers are a popular and versatile tool for artists, crafters, and hobbyists. However, like all markers, Posca's eventually run out of ink. While Posca doesn't currently offer official refills, you could refill your markers with water-based paint. This method can save you money, reduce waste, and even let you customise your colours. In this post, we'll show you how to refill your Posca markers with water-based paint, share some tips …