Wipe down the clothespin with a dust rag. Set the clothespin on a work surface with the straight "face" side up, with the magnetic side face down. The decoupage will be worked on the clothespin's face side.
Measure the length and width of the clothespin face side.
Mark measurements with a pencil and straight edge on the paper or fabric to be decoupaged onto the clothespin.
Carefully cut the paper or fabric as precisely as possible. For paper, use a craft knife and straight edge for accurate cuts.
With a foam brush, paint on a layer of decoupage medium onto the clothespin face. Press the paper or fabric onto the glue, lining up edges with the clothespin edges. Smooth with your fingers to remove any bubbles.
Immediately apply an outer layer of decoupage medium to the top of the paper or fabric. Let air dry.
Add 2 or more layers of either decoupage medium or non-yellowing varnish, allowing the clothespin to dry between layers. The decoupaged magnetic clothespin is now ready for use.