What is the best media to blast Stainless Bravo 3 props?

Discussion in 'General Maintenance/Repair Questions' started by William Miller, Dec 31, 2021.

  1. William Miller

    William Miller Member

    325
    Mar 16, 2007
    Darnestown, Maryland
    290 AJ
    Twin Mercruiser 300 hp Bravo III
    2006 AJ 290
    Longest season in the water since I bought the boat new in 2007.
    We pulled and blocked the boat yesterday. Pulled off the outdrives and brought them home.
    I spent a lot of time last year trying to get traces of barnacles off the props.
    I think it will be much quicker to use my sand blaster.
    What's the best media?
    Sand, ceramic, shells ?
    There's no sense to get a polished finish..
    So same question for drives to prep for new coat of etching primer and Trilux33...

    Thanks!
     
  2. Pirate Lady

    Pirate Lady Well-Known Member

    Jun 2, 2020
    Chesapeake Bay, Middle River
    '91 250 Sundancer
    7.4 Bravo 1
    If you have barnacles on the OD, try a better OD paint. I use this, never get barnacles.
    EA72722D-A31F-46C0-8EAE-2F53B12C893B.jpeg
     
    Phil S likes this.
  3. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    I've only done a little blasting over the years so I'll let others chime in on that - but I can't imagine any of those items being an issue to SS. BUT, another way to do it is to use something like MaryKate's On & Off which is HCl (and some other stuff). That will disolve the remanants of the little critters. If you find HCl or Muriatic Acid at a local hardware store, that will work, too. If you have decent blasting tools already, though, then I guess either way would be good.
     
    Tripsdad likes this.
  4. paulswagelock

    paulswagelock Well-Known Member

    Oct 25, 2010
    pa
    2018 SDX 270 OB 300 Verado
    Verado 300
    Muriatic acid from Lowes will clean that all up in 30 seconds.
     
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  5. Henry Boyd

    Henry Boyd Well-Known Member

    Apr 24, 2007
    Newburyport, on the peaceful and serene Merrimack
    ‘09 Sabre 38 Hardtop Express “Serenity”
    Volvo D6 w/IPS450 Pods
    Do not blast the props!
    Do not under any circumstances!

    Blasting will stress relieve the metal and that in turn will cause the thin metal of the blades to distort. Blasting can also roughen the surface and degrade the performance of the props.

    The better choice would be to send them to a prop shop that can clean, tune and balance the props. They can chemically clean the props so they come back all shiny.

    For the future you should use a prop specific product like Prop Coat, rather than metal bottom paint. BoatTest did a nice write just recently. It’s well worth a read.
     
  6. Pirate Lady

    Pirate Lady Well-Known Member

    Jun 2, 2020
    Chesapeake Bay, Middle River
    '91 250 Sundancer
    7.4 Bravo 1
    7F63ADD3-B531-42E9-A4A9-23715F822CDE.jpeg Here is my OD after painting with the stuff above, seriously, I may have chipped away a couple barnacles over the years but never felt the need to blast it.
    PS. that’s a 30yo (1991) Bravo 1. No corrosion, no pits, it’s a beautiful thing. Well maintained. OD don’t have to be sacrificial parts.
     
    Last edited: Dec 31, 2021
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  7. tony1b2000

    tony1b2000 Active Member

    218
    Oct 10, 2007
    Salem MA
    350 Sundancer 2010
    496 Mag Seacore Mercruiser , Bravo III
    If you cannot get Muriatic acid, Believe it or not, grout cleaner (from home depot) will dissolve the barnacles easily. Just wear some very good rubber gloves and goggles.
    Scrub with a 3m Blue or Green pad and done!

    I have heard of some folks using prop speed to protect against growth. Expensive and requires priming and several coats.
     
  8. boatrboy

    boatrboy Well-Known Member SILVER Sponsor

    Oct 3, 2006
    Orange, CT
    2006 340 Sundancer
    Twin 8.1 Horizons with V-Drives
    As stated above - I always used muriatic acid from Home Depot and scotch bright pads with good rubber gloves. I used a throw-away paint brush and put the props in a pan/bucket. I used to paint them with cold galvanizing compound paint but after getting them tuned, prop shop recommended not painting.
     
    Henry Boyd likes this.
  9. Jeremygavin

    Jeremygavin Well-Known Member GOLD Sponsor

    Mar 6, 2012
    Cape Cod, MA
    2011 520 Sedan Bridge
    2016 Sea Ray 19 SPX OB
    2019 Walker Bay Generation 340
    Cummins QSM11s
    Mercury 150 Fourstroke
    Honda 40hp
    If you put them in a tub with barnacle buster covering them, everything will dissolve off them overnight. Then literally just rinse them off with water. I put the the barnacle buster back into the gallon jugs after each use. Use a paint strainer to keep the debris from going into the gallon each.
     
    Nater Potater likes this.
  10. William Miller

    William Miller Member

    325
    Mar 16, 2007
    Darnestown, Maryland
    290 AJ
    Twin Mercruiser 300 hp Bravo III
    Thanks.
    No barnacles on the outdrives, just the props. Most came off with the pressure washer but have lots of little ones on inside area of the hubs.

    A lot of last years Trilux is worn down to the yellow primer I use plus it's hard to get at a lot of nooks and crannies.

    I'm not sure painting the props is good on an outdrive.

    I'll try the acid / barnacle buster.
     
  11. William Miller

    William Miller Member

    325
    Mar 16, 2007
    Darnestown, Maryland
    290 AJ
    Twin Mercruiser 300 hp Bravo III
    Anyone know the diameter of the props?
     
  12. Nater Potater

    Nater Potater Well-Known Member GOLD Sponsor

    Oct 19, 2020
    Southwest Idaho
    1992 300DA Sundancer
    Twin Merc Alpha Gen II I/O's with 5.7 V8's
    A lot of times, both the diameter and pitch are stamped somewhere along the hub.
     
  13. Espos4

    Espos4 Well-Known Member

    Jan 1, 2017
    Long Island NY
    2007 240 Sundeck
    350 MAG Bravo 3 W/DTS
    Acid, and old cookie sheet and a 99 cent chip brush.

    Placing the prop on the sheet slows you to collect and reuse the acid as it drips off the prop.
     
  14. sbw1

    sbw1 Well-Known Member

    Oct 10, 2006
    West Michigan
    This is listed in my signature
    This is listed in my signature
    What is the black line at the top of the prop? It looks like a crack but could be paint? Is there an imperfection in the prop there?
     
  15. Nater Potater

    Nater Potater Well-Known Member GOLD Sponsor

    Oct 19, 2020
    Southwest Idaho
    1992 300DA Sundancer
    Twin Merc Alpha Gen II I/O's with 5.7 V8's
    Zooming in, it looks like some paint.
    [​IMG]
    Pretty sloppy there, @Pirate Lady
     
  16. William Miller

    William Miller Member

    325
    Mar 16, 2007
    Darnestown, Maryland
    290 AJ
    Twin Mercruiser 300 hp Bravo III
    I bought and tried the toilet cleaner last year by putting it straight on the props.
    Ordered Barnacle Buster.
    While waiting I tried again.
    It took about 5 gal of water to cover the prop.
    Poured in what was left of the toilet cleaner. Checked back in about 10-12 hours and cleaned off the residue with green scotch Brite sponge.

    This is the forth one in the bucket tonight. Will check in the morning.
    Very happy how cheap and easy compaired to what I did last year.

    So will polishing the blades keep them cleaner longer?
    20220104_173822.jpg
     
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  17. William Miller

    William Miller Member

    325
    Mar 16, 2007
    Darnestown, Maryland
    290 AJ
    Twin Mercruiser 300 hp Bravo III
    20220105_082304.jpg Not bad!
    Should these be polished?
    Will it help reduce growth?
     
    Nater Potater likes this.
  18. Pirate Lady

    Pirate Lady Well-Known Member

    Jun 2, 2020
    Chesapeake Bay, Middle River
    '91 250 Sundancer
    7.4 Bravo 1
    Sorry Late reply, thats paint drip from the brush. I tend to make a mess.
     
    sbw1 likes this.
  19. Pirate Lady

    Pirate Lady Well-Known Member

    Jun 2, 2020
    Chesapeake Bay, Middle River
    '91 250 Sundancer
    7.4 Bravo 1
    Just like I like my women.
     
    Nater Potater likes this.
  20. Pirate Lady

    Pirate Lady Well-Known Member

    Jun 2, 2020
    Chesapeake Bay, Middle River
    '91 250 Sundancer
    7.4 Bravo 1
    WAIT A MINUTE! Hit the brakes! AmI reading this right? This is the first time the boat been pulled since 2007?
    Please tell me I misread that.
     

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