Options to make wood stairs slip resistant?
We'll be installing wood treads on our unfinished basement staircase before too much longer (I hope). There are small children (sometimes wearing socks) and elderly people who use these stairs, so they need to be slip resistant after hardwood treads are installed. We already have the wood, so that's locked in. I don't want to use a carpet runner (the location is a dirt magnet and we also have pets), and the treads are not uniform in shape so I don't think the premade nonslip tread covers that you lay on top will fit. (Some of the stairs are wedge-shaped as the staircase turns 90 degrees.) I have heard of the Shark Grip paint additive; has anyone used it, and do you all have any idea if it can be added to a wood finish other than paint? Should we finish the wood with a penetrating oil instead of poly? (I am interested in low VOC finishes anyway.) Would it be better if I painted them, so that I can use the slip resistant paint additive? What has worked for other people with hardwood stair treads?
Thanks in advance!