Painting the Drive and underwater
hull
Painting the drive
The SX and DPS sterndrives and transom shield use
a silicon-alloy aluminum casting process. The process-
requires a unique paint repair procedure.
Preparation
WARNING! Always follow the manufacturers
instructions regarding personal protection when
handling chemicals. You should always wear eye
protection and gloves as a good work habit.
1. Remove all marine growth.
2. Use sandpaper or sandblast to remove loose paint
and corrosion. Use a medium grit aluminum oxide
sandpaper. If sandblasting use 55 - 25 grit (0.2 -
0.7mm) aluminum oxide blasting media.
CAUTION! Do not use steel wool or emery cloth.
Small pieces of steel or iron oxide used to pro-
duce steel wool and emery cloth will be-come
embedded in the aluminum and cause severe
corrosion.
3. Wash with hot water and detergent to remove all
traces of oil and grease.
4. Roughen any painted areas that will be re-coated
with a medium synthetic scouring pad or equiva-
lent (i.e. 3M Scotchbrite™).
5. Rinse with water thoroughly and allow to air dry.
Do not use a rag to wipe the area as some rags
may have silicone.
6. Clean the entire area with an acid cleaner that
does not contain fluoride (i.e. DuPont® 5717).
Scrub surface with a synthetic scouring pad until
it is completely “wetted,” where no water beads on
the surface. Follow all local laws and regula-tions
when using or disposing of any chemicals used in
this process.
CAUTION! Fluorine in a cleaner causes “smut”
(a dark discoloration on silicon-alloy aluminum
castings), and paint will not stick to “smut”. If this
happens, sand the surface and start over using a
different acid cleaner.
7. Rinse with water thoroughly and allow to air dry.
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