Like Tree1Likes

Yellow fiberglass stains

Old 07-16-2008, 02:14 PM
VIP Member
berns29scarab's Avatar
Join Date: Jul 2004
Location: Brick, NJ
Posts: 6,969


Last edited by berns29scarab; 07-16-2008 at 03:17 PM. Reason: add'l info
berns29scarab is offline  
Reply With Quote
Old 07-16-2008, 02:16 PM
VIP Member
racer-x6's Avatar
Join Date: Mar 2001
Location: Mississippi
My Boats: Mid Stream Marine
Posts: 1,454

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.
racer-x6 is offline  
Reply With Quote
Old 07-16-2008, 02:18 PM
Join Date: Aug 2007
Posts: 198

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.
B one is offline  
Reply With Quote
Old 07-16-2008, 02:25 PM
Gold Member
Gold Member
fabin61's Avatar
Join Date: Jan 2007
Location: Erie, PA
My Boats: '97 Baja 322
Posts: 239

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!
fabin61 is offline  
Reply With Quote
Old 07-16-2008, 02:27 PM
Join Date: Feb 2006
Location: Tallahassee, FL
My Boats: 1987 Donzi 22; 2008 Donzi 28 ZXO
Posts: 1,654

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.
VetteLT193 is offline  
Reply With Quote
Old 07-16-2008, 02:29 PM
fandango's Avatar
Join Date: Feb 2002
Location: Solomons Island, MD, Vero Beach, FL
Posts: 396

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!).

fandango is offline  
Reply With Quote
Old 07-16-2008, 03:32 PM
Charter Member # 55
Charter Member
Griff's Avatar
Join Date: Oct 2000
Location: Omaha
My Boats: .......32............. ...............Active Thunder....
Posts: 15,741

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.
Griff is offline  
Reply With Quote
Old 07-16-2008, 09:01 PM
marineclean's Avatar
Join Date: Sep 2006
Location: Closer than you might think..........
My Boats: 12ft. Aluminum Canoe
Posts: 1,442

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!

marineclean is offline  
Reply With Quote
Old 07-16-2008, 09:40 PM
BY U BOY's Avatar
Join Date: Aug 2005
Location: HOUSTON ,TX
My Boats: 91 Scarab 21' Excel/1999 Proline 200 sport
Posts: 8,778

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.
BY U BOY is offline  
Reply With Quote
Old 07-16-2008, 10:13 PM
thisistank's Avatar
Join Date: Aug 2001
Location: Channel Islands, So. Cal.
My Boats: Making the best in the industry BETTER for over 25 years...... Lip-Ship Performance 305-933-9988
Posts: 10,672

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.
thisistank is offline  
Reply With Quote

Related Topics
Thread Starter
Last Post
Fiberglass and Paint
05-01-2008 01:46 PM
General Boating Discussion
06-19-2006 08:07 PM
G Man
Fiberglass and Paint
10-24-2005 08:25 AM
always wanted
General Q & A
04-14-2005 08:03 PM
US1 Fountain
General Q & A
03-31-2004 07:25 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -5. The time now is 10:27 AM.

Copyright 2011 OffShoreOnly. All rights reserved.