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                          Type

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                         Type      

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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