Use the correct type and grit sand paper

Thorough sanding is required to ensure optimum mechanical adhesion and to create a smooth finish. Bare surfaces, primers, undercoats and fillers need to be dry sanded in order to avoid the absorption of moisture.

Sanding between fresh topcoats and varnishes can best be executed with a fine grit wetordry sandpaper and water. For every surface use the correct sanding paper and grit.

Avoid mechanically sanding in combination with coarse sandpaper as this causes too rough sand marks. Also too much film thickness is being sanded down and consequently sufficient film build-up will not be achieved.  After sanding remove all dust and degrease once more.

TIP: Sand bare wood along the wood grain. Always sand fresh varnish layers by hand with a fine grit wetordry sanding paper and water.

Sanding bare surfaces                                  P-Grit                         

Bare GRP/fiberglass                                     320-360 dry

Bare steel                                                      60 dry

Bare wood                                                   180-220 dry

Existing paint/varnish layers                           220-320 dry

 

Sanding painted surfaces                                P-Grit                              

One-component primer coats                         220-320 dry      

Two-component primer coats                          180-220 dry

Fresh one-component topcoats                       400-600 wet

Fresh Twocomponent PU topcoats                  320-360 wet

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