Hi Mark, Hmm! The gum will go gooey with heat (sun if you get any!) or go brittle with time and fall off. Thin card or heavy grade paper (depending on scale) and Ezekote or similar would be better. Cheers Doug 😎
Young at heart - slightly older in other places 😉 cheers Doug Grant me the Serenity to accept things I can't change, the Courage to change things that I can, and the Wisdom to know the difference!