Best outdrive paint for corrosion

Discussion in 'General Maintenance/Repair Questions' started by DWABoat, Jan 14, 2020.

  1. DWABoat

    DWABoat Active Member

    Aug 13, 2019
    S Louisiana
    2001 280 Sundancer
    1989 220CC Cuddy Cabin
    Twin 4.3 w/Alpha Ones
    5.7 Mercruiser Alpha One
    What type of paint is best to block corrosion?
    Acrylic enamel
  2. KevinC

    KevinC Well-Known Member

    Feb 25, 2011
    Long Island, NY
    2004 340 Sundancer
    Twin 8.1 V-drives
    If you keep the boat in the water Interlux Trilux 33 is the best out drive paint. Its not pretty and you put it on thick.
    If you have bare metal you would want to prep with Interlux Primocon Metal Primer.

    Last edited: Jan 14, 2020
    Mike sandor and Espos4 like this.
  3. radscoot

    radscoot Member

    Nov 8, 2016
    Georgian Bay, Canada
    260 Sundancer, 2006,
    5.7 Merc/Bravo 111
    Does the Trilux actually prevent corrosion or is it just an anti foul paint suitable for Aluminum Outdrive?
    If it’s going on thick how can you tell if corrosion is happening underneath or not?

  4. hottoddie

    hottoddie Well-Known Member

    Jan 11, 2012
    Boston/Cape Cod
    1986 Sea Ray 390 EC
    Garmin 4212 Chartplotter
    Garmin 24 HD Radar
    Garmin 546s Plotter
    454 Crusaders
    I wonder if Rustoleum Cold Galvanizing would work well on an aluminum outdrive. The aluminum is slightly more noble than zinc so therefore the zinc in the cold galvanizing should provide protection from corrosion. Many of use use on all our underwater stainless steel and bronze running gear with great success.
  5. AeroNick

    AeroNick New Member

    Aug 20, 2016
    SouthEast Georgia
    2007 260 Sundeck
    Merc 5.7
    Three weeks ago I sanded the outdrive where the paint was flaking off and touched it up with Rustoleum 9300 primer, several coats. I then applied Rustoleum 2100 black enamel, sprayed 4 light coats with drying in between each coat. I will see if this application holds up to being in the water. My boat is dry stored when not in use so I get to see if it’s holding up with each launch.
  6. BillK2632

    BillK2632 Well-Known Member GOLD Sponsor

    Jun 25, 2009
    Lake Norman, NC
    1999 185 Bowrider,
    Mercruiser 4.3, Alpha I
    There is not necessarily any paint type that will prevent corrosion - for outdrives either an anti fouling paint like Interlux or an enamel like Rustoleum is fine - depends on if you want the original shiny look or are trying to prevent growth. Corrosion starts to get a foothold anywhere the paint wears away (on the skeg) or starts to peal (along edges). Once bare aluminum is exposed, the corrosion will start. The speed and intensity will depend on things like SS vs aluminum propellers, the type of anodes and condition and if something like a Mercathode is on place and working. Periodic inspection and touch up are key - especially if the boat stays in the water. Most of the drives I see in my dry storage look new, even the BIII's that are 10+ yrs old.

    I painted my Alpha I, which is dry stored, about 5yrs ago. Just did the lower half. I sanded the whole thing, then applied a Zinc Chromate primer and three coats of black Rustoleum. I expected it to last a couple of years, but now 5yrs later it still looks great. If I ever do it again I will probably use the Quicksilver Phantom Black as the Rustoleum is not a perfect match. The picture is after a year of use.

  7. KevinC

    KevinC Well-Known Member

    Feb 25, 2011
    Long Island, NY
    2004 340 Sundancer
    Twin 8.1 V-drives
    Any paint ia going to seal the metal from corrosion. My comments regarding trilux were if you were keeping the boat in the water. In that case you want the best antifouling paint combined with corrosion protection. You also want to make sure you are using the proper anode for the type of water you are in.

    I am guessing this was for a B3, so with an aluminum housing you want to make sure the paint does not have any galvanic properties that would promote the corrosion.

    This is why there is a border recommended for bottom painted boats around the B3 transom assembly.

  8. DWABoat

    DWABoat Active Member

    Aug 13, 2019
    S Louisiana
    2001 280 Sundancer
    1989 220CC Cuddy Cabin
    Twin 4.3 w/Alpha Ones
    5.7 Mercruiser Alpha One
    Thanks for all the responses. Lots of good info.
    I am asking for one of my workboats. We have dual Konrad 680 outdrives (similar to B3’s just bigger) with SS duo props in moving fresh silty water (MS River).
    Lots of stainless.
    We have a really good impressed current system now, but have some bald spots from before we had the system. We will go with a good base primer and the Merc Phantom acrylic.
    Thanks again.
  9. Espos4

    Espos4 Well-Known Member

    Jan 1, 2017
    Long Island NY
    2007 240 Sundeck
    350 MAG Bravo 3 W/DTS
    +1 for Trilux 33 (liquid applied with a brush)

    my 2007 B3 has been wet slipped 6 months/year in salt water since new.

    It’s not going to win any beauty contests but no corrosion on the housing. I wouldn’t use anything different.
    JVM225 likes this.
  10. JVM225

    JVM225 Well-Known Member GOLD Sponsor

    Apr 8, 2008
    Farmingdale, NY
    2002 410 Sundancer, Monaco Edition.
    3126 Cats.
    That’s what I used on my old boats outdrives and my kids outdrive.

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