I've run into a problem with my latest project. i'm working on a box approx 20"x20"x15" made from pine plywood. i put 4 plugs in the box that cover up a t-nut embedded in the sides of the box. the plugs are made from pine and are 7/8" and fit in a 7/8" hole i drilled out with a spade bit. i gued the plugs in with titebond II and clamped them with C clamps.
the problem i am having is i am trying to sand the plugs flush with the box but it isn't working very well - my ROS is taking off material around the plugs faster than it is taking material off the plugs themselves. i started with 80 grit and worked up to 200 grit.
i don't know a lot about sanders but it seems like mine has too soft of a pad or something. it is the Velcro type.
I've also had this problem with various other plywood, where the lighter parts of the plywood sand faster than the darker parts and i get a wavy finish.
i need some advice on what to do.