Link doesn't seem to work at the moment...

The main drawback of using these kinds of materials on cockpit seats is wear and tear to the seat of the oilskins. Faux teak is a better solution. Fortunately my present boat has non-slip patterned GRP on all the horizontal surfaces, but if I had kept my previous one I would have replaced the failing teak slats with faux teak.Treadmaster do two patterns: the diamond shape incised pattern and a “smooth” pattern. I’ve fitted the smooth pattern on my Hurley 18 cockpit seats and hatch, replacing the original smooth pattern stuff which had begun to break up. Good non slip surface but nicer to sit on than the diamond pattern. Link to some here Treadmaster - Marine Scene
The main drawback of using these kinds of materials on cockpit seats is wear and tear to the seat of the oilskins. Faux teak is a better solution. Fortunately my present boat has non-slip patterned GRP on all the horizontal surfaces, but if I had kept my previous one I would have replaced the failing teak slats with faux teak.
The 'smooth' Treadmaster is very non-abrasive. It doesn't mark or abrade skin and definitely has no adverse effect on oilskins. Having said that, it is surprisingly non-slip. Had it on the cockpit seats for several years and it seems to be very robust too.