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Thread: Yellow fiberglass stains

  1. #21
    Registered berns29scarab's Avatar
    My Boats:
    99 27 Kryptonite
    Join Date
    Jul 2004
    Brick, NJ
    Last edited by berns29scarab; 07-16-2008 at 02:17 PM. Reason: add'l info

  2. #22
    Registered VIP Member racer-x6's Avatar
    My Boats:
    Mid Stream Marine
    Join Date
    Mar 2001
    Everytime you use muriatic acid it is etching the hull, that is why it stains worse each time. the hull must be polished to get the glaze back and close the pours. This is a lot of work but is the only way to reduce the staining.

  3. #23
    Join Date
    Aug 2007
    I use a wax called Great White I put it on the bottom and out drives before I go out, but I don't wipe it off. When I wash it at home then I take the wax off. Sometimes I will wax it again the next day and just leave it on for my next outing. I haven't used leaverage wax yet but everybody say's it's good.

  4. #24
    Gold Member Gold Member fabin61's Avatar
    My Boats:
    '97 Baja 322
    Join Date
    Jan 2007
    Erie, PA
    GREAT THREAD. I see a lot of product but where are you guys getting them from? Local grocery, auto, marine store, online? where from, let's post that too!

  5. #25
    My Boats:
    1987 Donzi 22; 2008 Donzi 28 ZXO
    Join Date
    Feb 2006
    Tallahassee, FL
    Quote Originally Posted by fabin61 View Post
    GREAT THREAD. I see a lot of product but where are you guys getting them from? Local grocery, auto, marine store, online? where from, let's post that too!
    FSR and on/off can be bought at just about any marine store. I'd still highly recommend FSR over on/off. It is night and day easier to use FSR.

  6. #26
    Gold Member Gold Member fandango's Avatar
    Join Date
    Feb 2002
    Solomons Island, MD, Vero Beach, FL
    Here in the Chesapeake Bay, we all have the same problem. No wax is going to stop it (despite what people will tell you). Yes the glass get pourous over time (you won't see new boats with the same problem). All the cleaners are basically acid based and will remove the stain which in turn opens up the fiberglass pours. Take a spray can of clear, spray a small spot anywhere on your hull. Let stay in water for a while and notice no yellow where clear was sprayed. I know boats that have been cleared on the hull and thus no staining (you have to know what you are doing to correctly clear a hull or it will peal -people will say you can't paint or clear a hull - BS it can be done!).


  7. #27
    Charter Member # 55 Charter Member Griff's Avatar
    My Boats:
    ..........32........... Active Thunder
    Join Date
    Oct 2000
    I agree, clearing a hull can be done and will be fine as long as the boat does not sit in the water for more than a day or two.

  8. #28
    Registered marineclean's Avatar
    My Boats:
    12ft. Aluminum Canoe
    Join Date
    Sep 2006
    Closer than you might think..........
    Is it mild or not?? That's the question. By U had BAD yellowing that would come back the next day. If it's just a waterline then use a chemical, FSR is good. If it's a permanent stain then try buffing like By U. If buffing won't do the job then try some light wetsanding. IF It's stained then you have to go Deeper. He stays on top of it with my Polish now and his hull is doing great!

    The best advice is in the beginning. Put the Polish on when the boat is new!!! I try to visit with every manufacture, but it's hard to get through. I'm not claiming to have the perfect, solve all your problems Polish, but my numbers are great and my Marine Clean work speaks for itself. The Polish makes it allot easier to maintain.

    Thanks Guys!


  9. #29
    Registered BY U BOY's Avatar
    My Boats:
    91 Scarab 21' Excel/1999 Proline 200 sport
    Join Date
    Aug 2005
    Quote Originally Posted by Chris288 View Post
    Wet sanding is just BAD advice.
    Well for me it was the only way to keep the staining from coming back.. Donnie recommended that I do some light wet sanding and follow up with Leverage. I tried all the tricks that are on the board except for the ringo. They were temporary fixes. Since I did the wet sanding I don't get the yellowing that i use to after a day in the water. Now keep in mind this was just happening on my transom and the sanding only took me a day.If it was my entire hull I would just say phuck it and keep using the muriatic acid. Just my experience take it the way you want.

  10. #30
    Registered thisistank's Avatar
    My Boats:
    Making the best in the industry BETTER for over 25 years...... Lip-Ship Performance 305-933-9988
    Join Date
    Aug 2001
    Channel Islands, So. Cal.
    FSR by Davis is the BEST PRODUCT for removing yellow stains on the bottom of the boat. I bought an industrial size and I do it every few times after running. It takes off the iron deposits that attach themselves to the gel and make that yellow staining.

    Easiest stuff in the world to use. Wipe it on with the use of a rag and spray it off. It f*cking incredible watching the yellow vanish seconds after you wipe the product on.

    Buy this stuff and use it. You will absolutlely not be disappointed!

    Here's the link to the product. You can also buy it from West Marine and Boaters world.

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