If nothing else works try a little acetone on a small area and see if it does the trick.
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| Sudden Hull Discoloration http://www.hobie.com/au/en/forums/viewtopic.php?f=14&t=38666 |
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| Author: | Maximus [ Fri Sep 23, 2011 7:10 am ] |
| Post subject: | Sudden Hull Discoloration |
Went sailing in the ICW the other day and pulled boat up on a leeward, seaweed choked shore for about an hour. We sailed the boat back to the ramp and discovered the gelcoat below the waterline had a very obvious dark gray tint to it. Getting it home, I used a brush and soap on it.... no improvement. I then tried, one after the other, Comet, WD-40, 409, Limeaway, Fantastic.... none of which had any effect whatsoever on this sudden stain! I haven't tried Bar Keepers friend yet, but so far the only thing that makes an improvement is sandpaper. Very strange. |
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| Author: | reelknotty [ Fri Sep 23, 2011 8:26 am ] |
| Post subject: | Re: Sudden Hull Discoloration |
may or may not be the same type of stain but i get the black rain stains on the power boat all the time. I use softscrub with bleach and it comes right off. |
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| Author: | reelknotty [ Fri Sep 23, 2011 8:28 am ] |
| Post subject: | Re: Sudden Hull Discoloration |
also a good coat of wax will help keep it off in the future. or at least make it easier to clean up. |
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| Author: | Maximus [ Fri Sep 23, 2011 9:04 am ] |
| Post subject: | Re: Sudden Hull Discoloration |
Thanks guys... I'll try both the soft scrub and the wax. |
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| Author: | MBounds [ Fri Sep 23, 2011 9:09 am ] |
| Post subject: | Re: Sudden Hull Discoloration |
You need to use something with oxalic acid in it first - Barkeepers Friend, ZUD, OxyClean, etc. Then put the wax on. Otherwise, you're just sealing the stain in. |
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| Author: | fastcat [ Fri Sep 23, 2011 9:14 am ] |
| Post subject: | Re: Sudden Hull Discoloration |
If nothing else works try a little acetone on a small area and see if it does the trick.
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| Author: | GD_NC [ Fri Sep 23, 2011 11:59 am ] |
| Post subject: | Re: Sudden Hull Discoloration |
The lake where I sail has a lot of red clay that stains the hulls. I use Star-Brite Hull Cleaner. Work well on all sorts of stains. |
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| Author: | Tim H16 [ Fri Sep 23, 2011 12:43 pm ] |
| Post subject: | Re: Sudden Hull Discoloration |
Another good product that is safe to use on gelcoat, etc. is "RustAid - Outdoor" from Home Depot or Lowes. I primarily use it to remove rust stains caused by irrigation sprinklers around my yard, but have also been using it for many years to clean the brown stains off the gelcoat, etc. of my powerboats and previous white hulled Hobie14T caused by exposure to organic acids as: tannic, humic and fulvic in our brackish water (in addition to rust stains). The active ingredients in RustAid are: Hydrofluoric Acid and Oxalic Acid. I usually dilute it with water in a hand pump sprayer, spray it on, wait a few minutes and then rinse it off and the stain is gone. Once you get rid of your gelcoat stains, it is best to seal the porous gelcoat with a wax so it will be less likely to stain again. 
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| Author: | rehmbo [ Fri Sep 23, 2011 1:48 pm ] |
| Post subject: | Re: Sudden Hull Discoloration |
I swear by MaryKate On&Off. I've used it on my ski boat for years and more recently on my H18. It is fantastic for any kind of water-borne stain I've come across. Found an MSDS sheet here It appears to be a witches brew of Hydrochloric, Phosphoric, and Oxalic acid. Feels real good when it drips down into scrapes and cuts, but my fingernails have never been cleaner! |
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| Author: | GD_NC [ Tue Oct 25, 2011 6:54 pm ] |
| Post subject: | Re: Sudden Hull Discoloration |
Anyone tried Ketchup? (not kidding) I hear it works as well as many commerical cleaners on fiberglass stains. Leave it on for a few minutes and them wipe it off. |
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| Author: | J_Eaton [ Sat Nov 05, 2011 6:41 am ] |
| Post subject: | Re: Sudden Hull Discoloration |
GD_NC wrote: Anyone tried Ketchup? (not kidding) I hear it works as well as many commerical cleaners on fiberglass stains. Leave it on for a few minutes and them wipe it off. No, but fresh sliced lemons or limes do work on most stains...the citric acid, much like the oxalic acid, does the trick
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| Author: | choctaw60 [ Sat Nov 05, 2011 6:55 am ] |
| Post subject: | Re: Sudden Hull Discoloration |
Watch out using Acetone. You can damage your finish really quickly. |
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| Author: | MBounds [ Tue Nov 08, 2011 4:18 am ] |
| Post subject: | Re: Sudden Hull Discoloration |
choctaw60 wrote: Watch out using Acetone. You can damage your finish really quickly. As long as it's gel coat (fully cured - the original finish on the boats), then acetone won't hurt it.If it's paint, then all bets are off. Same with any vinyl stickers. |
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| Author: | MVD [ Tue Nov 08, 2011 4:39 pm ] |
| Post subject: | Re: Sudden Hull Discoloration |
Matt Bounds is busy as the Primary Race Officer this week at the Hobie 16/20 North American Championships, yet he was up early this morning helping us out with our issues on this Forum. Mr. Bounds, I SALUTE YOU! On behalf of all us that you have helped over the years, THANK YOU. By the way, I've used acetone for years with no adverse effects. |
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