I'm restoring an old Lear 122 topper cap. It does not have a liner at present. Is there a certain brand that you can recommend? The proper adhesive to use? Also, would you recommend putting reflectix down first?

I'm restoring an old Lear 122 topper cap. It does not have a liner at present. Is there a certain brand that you can recommend? The proper adhesive to use? Also, would you recommend putting reflectix down first?