HOW DO I PREPARE THE WOOD PRIOR TO USING CETOL PRODUCTS?
EXTERIOR - NEW WOOD
Wipe the wood with Special Thinner 216 to remove the oils from the surface. After evaporation of Special Thinner 216, sand all exterior surfaces with 120-grit sandpaper.
Remove all sanding dust by vacuuming followed by wiping the surface with a dampened cloth with 333 (2333N if varnishing with Perfection). Let the surface dry completely.
Wipe the surface once more and let dry completely before applying Cetol Marine or Cetol Marine Light.
INTERIOR - NEW WOOD
Spray the surface with clean water to wet the wood.
Clean the surface with a solution of Tri-Sodium Phosphate (TSP) dissolved
Apply the solution and scrub the wood with a sponge/synthetic abrasive pad.
Rinse the surface with a damp sponge until completely free of the cleaning solution.
Let the wood surface dry out completely before coating (i.e. the moisture content must be below 18%).
Lightly sand the wood with 180-220 grit sandpaper along the length of the grain.
Use a brush or vacuum to remove all sanding dust.
Original article from Interlux (pdf)