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DSM300 Installation Manual
CAUTION:
There is no way to determine if the outer skin is solid (no trapped
air bubbles in the fiberglass) at the selected location before
cutting the inner skin.
WARNING:
Always wear safety goggles and a dust mask.
1. Using a 4" (100 mm) hole saw, cut through the inner skin and the core at the
selected location (see Figure 2-24 ). 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 hull.
2. Remove the plug of core material, so the inner core of the hull is fully exposed.
Sand the inside surface of the outer skin using a miniature disc sander. Slightly
undercut the surrounding coring if possible.
3. Clean and dry both the inside surface of the outer skin and the housing with a
weak solvent, such as alcohol, to remove any dust, grease or oil.
CAUTION:
Do not proceed if the hull temperature is below 60° F (15° C) since
the cure time of the casting epoxy will be greatly extended.
4. If the hull temperature is above 60° F (15° C), mix a half cup of casting epoxy
stirring carefully to avoid trapping air in the mixture.
Pour this around the housing until the cavity is full. Allow the casting epoxy to
set for at least 1 hour.
Figure 2-24: Installation in a Cored Fiberglass Hull
5. Proceed with step 7 of “Installation” on page 54.
D5006-2
100 mm(4 in)
Transducer assembly
Inner skin
Core
Outer skin
Fill with casting epoxy
Hull thickness
