Figure 4 - Preparing A Cored Fiberglass Hull - Maretron DST110 User Manual

DST110 User's Manual
Drill a 3 mm or 1/8" pilot hole from inside the hull. If there is a rib, strut, or other hull
irregularity near the selected mounting location, drill from the outside. (If the hole is
drilled in the wrong location, drill a second hole in a better location. Apply masking tape
to the outside of the hull over the incorrect hole and fill it with epoxy.)
1. Figure 5).
2. From inside the hull, use a 60 mm or 2-3/8" hole saw to cut through the inner skin and
most of the core. The core material can be very soft. Apply only light pressure to the
hole saw after cutting through the inner skin to avoid accidentally cutting the outer skin.
3. Remove the plug of core material so the inside of the outer skin and the inner core of
the hull are fully exposed. Sand and clean the inner skin, core, and the outer skin
around the hole.
Caution: Completely seal the hull to prevent water seepage into the core.
4. If you are skilled with fiberglass, saturate a layer of fiberglass cloth with a suitable resin
and lay it inside the hole to seal and strengthen the core. Add layers until the hole is the
correct diameter.
Alternatively, a hollow or solid cylinder of the correct diameter can be coated with wax
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Figure 4 – Preparing a Cored Fiberglass Hull
Revision 1.3