Sail tape works well but, sometimes you can't or don't want to use it. Wind Shear, the adhesive used to repair mylar sails also works for this.
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<br>Spread a very small amount on the area you want to repair,cover it with wax paper, and rub it FLAT with something heavy and smooth (like an iron). Let it dry and peel the paper off.
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<br>You might want to practice on a scrap first. My first attempt looked pretty bad<br><br>