Step 4: Seal the Joints

Seal the Joints when installing fiberglass gutters
Photo: Anthony Tieuli
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To join miters and attach end caps, superglue the pieces together and tape over the joint on the outside of the gutter. Cut two 6-inch-wide strips of fiberglass mat long enough to cover the joint in the trough. Put on an organic-vapor respirator and gloves, and wipe the sanded surfaces with acetone. Brush a mix of polyester resin and gelcoat into the trough and onto the strips until the fibers are saturated. After 30 minutes, snip off any projecting fibers and remove the tape.
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    Tools List

    • pencil
      Pencil
    • 30-foot tape measure
      Measuring tape
    • brad nailer
      Brad nailer
    • miter saw
      12-inch miter saw
    • four-foot level
      4-foot spirit level
    • chalk line
      Chalk line
    • dust mask
      Dust mask
    • latex gloves
      Latex gloves
    • eye goggles
      Eye protection
    • sandpaper
      80-grit sandpaper
    • respirator
      Organic-vapor respirator
    • drill
      Drill/driver
    • Painter's Tape
      Painter's tape
    • Natural-bristle chip brush
      Chip brush
    • utility knife with hook blade
      Utility knife
    • hole saw
      2 ½-inch hole saw
    • nut driver
      Nut driver

    Shopping List

    Fiberglass gutter

    5/4x6 cellular PVC trim

    18-gauge stainless-steel brad nails

    3 -inch stainless-steel structural screws

    Stainless-steel sheet-metal screws with hex washer head

    Superglue

    Acetone

    Fiberglass mat

    Polyester resin and hardener

    Gelcoat

    Fast-cure marine-grade polyurethane sealant

    Microballoon filler