We use 1/16" or 1.2 mm thick lexan or aliminiun for bibs here in Australia for small lures and up to 1/8" for or heavier lures for chasing Cod.Big lures always get bibs pinned in postition aswell as glueing.Easy place to find lexan is try your local hardware store and use the flat skylight sheets that you would put in your roof for your shed or patio.These are called polycarbonate sheeting same stuff as lexan.
Cheerz Seagull