On The Run

Hard To Buff Ink


OTR.970 is ultra permanent alcohol-based superior ink. This legendary ink is the nightmare of cleaning crews. Optimized for the OTR.070 & OTR.071Hard to Buff Marker and the ON THE RUN Soultip™ squeeze markers, OTR.970 works perfectly with a wide variety of painting and writing instruments.


Multi-purpose use! For indoor & outdoor use.  Works on paper, metal, plastic, glass, and stone. Can be used on canvas, walls, mixed media, and many other surfaces. Best on smooth and dust-free surfaces!


Use the OTR.970 HARD TO BUFF INK with alcohol-based ink markers, pump action valve markers, brushes, air brushes, or any mob & squeeze marker etc.


New and improved formula!





. alcohol-based ink


. 210+ ml

. Color: Deep Black


Multi-purpose use!


• ultra permanent
• fast drying
• highly pigmented & opaque
• strongly smudge- & scratch-
• strongly UV- & heat-resistant
• weatherproof
• xylene-free


Wear gloves!


Optimized for the OTR.070 & OTR.071 Hard to Buff Markers,  ON THE RUN FLOWPENTM & SOULTIPTM SQUEEZE MARKER