I mixed my "anti-slip" into the clear coat and be sure to stir / mix it often. Did you look at or consider using Shark Grip? I did a a bit of research on this site and others and in the end decided that the Shark Grip product provided the best compromise between anti-slip properties, feel, and cleanabilty. You can buy it a Lowes or Sherwin Williams (I think SW actually has samples so you can see / feel what it is like). I used about 1/2 the suggested amount and really like the way it turned out.