sandpaper

If I wanted to make my own version of these (below) what kind of glue should I buy? Also, what kind of sand is good? I've seen sand, quartz and a few other things online. But who here has had the best luck with which combo of grit & glue? :unsure:

Hi, How are ye all, My conure Rio is coming up on 3 months on April 6th. I notice has nails are getting alone and I read online around putting sand paper in there cage for there beak and nails to keep them shortened. Is it a good idea to put sand in the bottom of his cage. At present I have...