I got the heavy weight polypropylene webbing from Custom Straps, Nylon & Polypro Webbings, Metal & Plastic Buckles at Strapworks.com, and it come in almost every color.
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I'd like to do this to my belt-end too. This is an area where webbing floppiness is particularity annoying. How stiff does the glue make it? Is it so stiff that it cracks when bent? Dry time? You're talking about typical PVC plumbing pipe glue like the Oatley stuff you find at Home Depot?