Here is a goal: Prepare a wood surface for spray painting.

Which way makes more sense to accomplish this goal?

Select from:
+ Sand the surface with sandpaper. Start with 80 grit and move down to 120. Clean the surface with a damp rag then let dry. After it is dry, use a light layer of marshmallow fluff to make sure the paint sticks.
+ Sand the surface with sandpaper. Start with 80 grit and move down to 120. Clean the surface with a damp rag then let dry.
Sand the surface with sandpaper. Start with 80 grit and move down to 120. Clean the surface with a damp rag then let dry.