If you insist on using a palm sander either use it over the entire floor not recommended or hand sand with 80grit over the areas that you palm sanded.
How to use floor sanding edger.
The floor sander you should use for sanding the edges of the floor is a 6 or 7 inch disk sander.
A flooring edger is a type of disk sander and with a drum sander is one of two heavy duty sanding machines that refinishers use to sand a wood floor.
Even though these two machines differ greatly in size their power is well matched and both remove the same depth of wood when using the same grit.
It is not ideal for staining but is fine for a natural floor.
The disk is installed on the weighted.
The edger is used for sanding around the edges of a room as well as for areas that are too shallow to use the drum for example hallways where the floorboards run across the width of the hall.
It s the power of these machines that definitely make them first choice.
Less powerful tools can just leave you working hard for hours and hours.