I have not used Rubio but I have used paste wax before glue up to prevent glue squeeze out from sticking in hard to reach areas.  I have both masked off the glue surface and also simply drawn a line and just made sure I didn't get any wax on the glue surface.  It made the glue pop right off.  

--Nathan, TX. Hire the lazy man. He may not do as much work but that's because he will find a better way.