Non-skid can be effectively used on the cabin sole. The 2 pics below show a solid teak sole with non-skid of walnut shells in varnish. After the sole is varnished, tape around areas you want to be non-skid, varnish and shake ground walnut shells on the surface. After the varnish dries, vacuum excess off, and varnish over. The pics are of a Sundeer. Ground walnut shells used to be available at West Marine but I don't know if they still are.
Living aboard in Victoria Harbour