How can I cut a scrap piece of outdoor carpet into runner & seal edges

by Adriana
I have a large piece of indoor/outdoor carpeting and want to cut a 10' length x 4' wide runner, how can I seal the edges so it will not fray? I was thinking of alot of caulk and just pressing it down to make a "rubber" edge but not sure if it will stay. Any ideas? I am also going to stencil it when done.
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