Hi. I am only a beginner and don't profess at this point to know what's good or bad but I was just sent a sample pack of PickGrips by a company called Tractiongrips that makes non-slip stick-on grips for firearms. I have zero to do with the company but you may find their latest offering for guitar/bass picks interesting. Peel off, stick on, the sucker ain't going nowhere. Offered in black grit and gray and black rubber.
www.tractiongrips.com
www.tractiongrips.com