And if if must be a soft-pack, consider using PTFE film against the gilding. Hopefully the frame isn't overly ornate so that you can place the film between pads and frame rails. I've only used the film which is basically plumbers tape in a 12 inch roll against painted surfaces, but had outstanding results. The brand I have tried is called Teflon Relic Wrap and it ran about 140 dollars for a 100 feet.