Wax coat your paper roses with tinted paraffin. Have your paraffin melted in a double boiler, then spoon it into the rose petals to coat lightly. When you are satisfied with the inside of the rose, quickly dip the entire flower into a deep pan of melted paraffin to coat the back of the petals. You do this with a quick (in and out) motion, then hold and turn the flower gently to disperse the paraffin evenly over the flower, and to allow any excess to drip back into the pan. Don't coat the rose heavily, or the wax will crack. Back in the late forties and early fifties, Mothers used to make roses (like your crepe paper roses) and wax them. Their children would then go door to door to sell them for Valentine's Day, and Mother's Day.