Uneven floorboards with red paint will be sanded diagonally with grit 16 to the laying direction until the "wave" and the red paint is almost removed. After that you ONLY sand in laying direction of the floorboards to remove the diagonal traces from grit 16 to 120 .
|1.||Sander||Grit 16, diagonal|
Floorboards with old varnish you usually start sanding with the grit 40.
Before beginning to sand the floorboards, the nails must be hammered in in order not to damage the sanding paper or the sanding drum.
Sand uneven floorboards diagonally with grit 16.
After sanding the floorboards diagonally you only sand from grit 16 to grit 120 in laying direction of the floorboard.
When sanding with grit 24 has been completed, you have to hammer in the nails the weren´t visible before. Clean the gaps between the floorboards and fill the nail holes with a mix of glue and the dust you got from sanding.
After sanding with grit 16 and 24 you sand with an edger the parts of the floorboard that the sanding machine hasn´t reached.
You change the floor and the edge sander from grit to grit. Then you are ready prepare the floor for sealing by cleaning it.
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