Drill two holes through the support plywood and repaired panels. The hole diameter
must be large enough to accommodate the foam nozzle. Position the holes a maximum of 24 inches
(600 mm) apart on a horizontal line below the upper edge of the repair patch.
Prepare proper density foam according to manufacturer's recommendations. Pour or
inject the foam into the cavity. When foam emerges from the second hole, close both holes with an
approved blind fastener. If foam does not come out of the hole(s), foaming is not complete and must
When all the holes have been closed, check for air pockets by tapping on the panel. If
air pockets are suspected, additional holes must be drilled, and the foaming process repeated.
After curing for manufacturer's specified time, remove the supports and complete the repair.