Best way to Plane Melamine Chipboard to fit Uneven Floor Kitchens, doors, rails, stud, tables, chairs, stair cases, garden furniture etc... Find answers and ask questions here!

[Zacccc]

I'm using chipboard from an old kitchen unit to box in exposed pipework in my bathroom. My measuring was pretty spot on but then I found that near the floor the wall goes out of true and therefore is not quite perpendicular. I tried to plane the edge of the melamine chipboard to make it fit snug to the wall but it's as hard as hell. Admittedly, the plane I'm using is a cheap one and probably not up the job but is there an easier way to do it? Thanks.

[welsh brickie]

try a belt sander