Re: Antifoul undercoat of outdrive
If i read your post to say you are taking your outdrive to bare metalI think you might want to go to Volvo's web sight and lookup how to repaint a bare metal outdrive. There is more to it then just slapping some primer and paint on it. There is a specfic way to
etch the bare metal and how and when to apply the primer and paint. There is alot to look at when taking it to bare metal.
http://www.4shared.com/file/10726715...X-A_DPS-A.html Starting on page 9
Read this. It tells you the proper way
" Edit " Link is not working, but here it is, right from volvo
Remove all loose paint and corrosion by sanding or sandblasting.
If sandblasting, use an aluminum oxide blasting media with a
particulate size of 0.008-0.028 in. (0.2-0.7 mm).
3. Remove all trace of grease and wash with hot water and
detergent. Roughen all painted surfaces with medium 3M
Scotchbrite pad. Rinse thoroughly with water.
4. Treat any bare aluminum with chromate conversion coating. Clean
the entire area with an acid cleaner that does not contain fluoride,
such as DuPont5717. Scrub the surface with 3M Scotchbrite pad
until it is completely “wetted” with no beads of water.
NOTICE! Fluoride in a cleaner causes a “smut” (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.
NOTICE! Do not use steel wool. Small pieces of steel wool
become embedded in the aluminum and will cause
severe corrosion.
5. Rinse thoroughly with water. The area must appear “wetted” or the
surface is not clean, and paint will not adhere.
6. While the surface is still wet from rinsing, treat all bare aluminum
with DuPont226S chromate conversion solution. Brush the
chromate solution as required for 2 to 5 minutes to prevent it from
drying on the surface. Rinse the surface thoroughly with water and
allow to air dry. Follow the label instructions exactly.
— If the chromate is allowed to dry anywhere on the bare aluminum
surface, chromic acid salts will form which will prevent
paint adhesion and promote corrosion. Sand the surface to
bare metal.
— It is best to let the part air dry, but if you must wipe the surface
to speed up drying, use lint free wipes not treated with anything
that may contaminate the surface. Do not scrub the surface,
wipe very lightly.
— Do not blow dry with shop air unless it is completely free of
dirt, oil, and water.
— Do not heat the part above 150?F, before painting.
— Do not touch the treated surface with bare bands before painting.
— The part should be primed soon after it dries, or at least within
24 hours.
7. Where the prime coat is thin or where the surface is unpainted,
prime with Volvo Penta Primer or PPG epoxy primer. Do not apply
primer over hard finish coat. Primer solvents must be allowed time
to evaporate and the primer must harden before applying the
finish coat. Allow 8 to 12 hours drying time.
8. Apply finish coat. The parts catalogs list numbers for finishing
products.
