Sand Face Frames after Grain Filler

What happens here

After the face frames have been primed (and implicitly, grain filler has been applied and dried), lightly sand them with a fine-grit sanding block or sponge. This step is to smooth out any remaining grain texture or minor imperfections, ensuring a silky-smooth surface that matches the prepared doors. Thoroughly clean off all sanding dust before proceeding to the top coats.

Goal: Smooth face frames after primer and grain filler application.