Fiberglass mesh drywall tape comes in rolls just as paper tape does, but unlike paper tape, is usually self-adhesive and can be applied directly to a seam without an undercoat of joint compound. It is more pliable than paper tape, however, and hairline cracks can develop unless you coat fiberglass tape with setting-type joint compound, or hot mud. The limited working time and difficulty of sanding hot mud may present challenges for the amateur drywall finisher. When applied correctly, though, fiberglass tape makes a stronger joint that is less likely to develop defects than one finished with paper tape in your home drywall project.
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