PERMAPRINT Hybrid Inks were developed specifically for printing on more exotic synthetic substrates like umbrellas & polypropylene tote bags that require higher opacity, a degree of flexibility but have to be air-dried due to the heat sensitivity of the substrate. You can try passing these through a drying tunnel at lowish heat, say 90°C (194°F) with maximum air flow to accelerate the drying process; however, you must first ensure that the substrate can cope with that heat. Here is a link to the Technical Data Sheet for PERMAPRINT Premium Hybrid Inks with more information