OP: need some info on your boat...
make:
model:
engine:
year:
if it has a volvo penta drive train or mercruiser belt pump (raw water on big blocks) then it can be done "in-water"
if it is an OMC or mercruiser with an alpha drive, then it HAS to be done "out-of-water"
LIforrelaxin: Goodhue Marine is no longer at Harilla Landing Yacht Club on the end of Long Island. new company Complete Marine Care
www.completemarinecare.com 253-4592 651-9727