Self adhering gauze in camo colors is usually available at Rural King in the veterinary aisle. Easy to apply. Easy to remove. Cheap. Does not mar the gun. Actually provides some protection from insect repellant off your hands.
If you're set on affecting the resale value, at least do a classy job. AllenM does nice Ceracoat work.
I appreciate the advice about "doing it myself." However, with this particular piece of hardware I'm not comfortable with that given the amount invested in the firearm. I'm looking for recommendations for someone who does this professionally. Thanks.