Then apply another layer of mod podge over the napkin to adhere.
After the entire lamp base is sufficiently covered, use the brown and black paint to add distress areas. Paint some cracked spots and add some smudged areas randomly on the napkins.
Finally, mix 1 part white chalk paint with 3 parts gloss mod podge and brush over the entire lamp base. Allow a heavier coverage in some areas to enhance the distressed look.
Note: Test a small are before covering completely to assure that the mixture isn't to heavy. You are wanting a milky coverage not completely white.