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  removing marine growth stains from hull

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Author Topic:   removing marine growth stains from hull
Maine whaler posted 03-03-2002 08:55 AM ET (US)   Profile for Maine whaler   Send Email to Maine whaler  
I kept my boat in all summer last year without bottom paint as I plan to sell it this year and the bootom had not been painted before. Despite pulling it out and cleaning the bottom twice during the season, and having it pressure washed at the end of the season, it still has some stains from the growth. What is the best way to get these off?
OutrageMan posted 03-03-2002 09:13 AM ET (US)     Profile for OutrageMan  Send Email to OutrageMan     
I have used "On Off" and a scotch brite pad.
maverick posted 03-03-2002 09:23 AM ET (US)     Profile for maverick  Send Email to maverick     
I've put Clorox in a small pump up sprayer and sprayed on my hulls. I let it sit for about 3 minutes and scrub or spray off. Be careful to avoid getting it on your skin/body without washing off immediately. Inexpensive and works pretty darn good. I agree with you on the paint & sell choice you made. Best, Mav
phatwhaler posted 03-03-2002 02:28 PM ET (US)     Profile for phatwhaler  Send Email to phatwhaler     
I get a funky yellow tint to my boat after letting it sit in the water for a while. I use Star-Brite Rust stain remover. I spray it on, let it sit for a few minutes and whala! It seems to work best when there is strong sun light. May be my imagination. Clorox won't take the stain off, but thos stuff works great. I believe it's a mild acid.
Rich Seidel posted 03-03-2002 03:47 PM ET (US)     Profile for Rich Seidel  Send Email to Rich Seidel     
Haven't had a stain yet, or anything else that Slimey Grimey hasn't taken off. Really stubborn might be 2-3 applications. Fresh water experience only.
Steve Leone posted 03-03-2002 07:28 PM ET (US)     Profile for Steve Leone  Send Email to Steve Leone     
BEST REMEDY: 1500 WET/DRY SANDPAPER. NONTOXIC, WORKS LIKE A DREAM. JUST DIP IT IN SOME WATER, RUB A DUB, AND BINGO, OFF COMES THE SCUNGE. OLD BODYMANS TRICK WILL ALSO RESTORE A FADED GELCOAT. REALLY WORKS WELL. TRY IT. STEVE OUT.
tabasco posted 03-03-2002 07:50 PM ET (US)     Profile for tabasco  Send Email to tabasco     
Lysol Toilet Bowl cleaner
Mark Gallagher posted 03-03-2002 08:01 PM ET (US)     Profile for Mark Gallagher  Send Email to Mark Gallagher     
I recommend a blue gel stain remover like FSR that is sold in most large marine stores such as Boat US and West. Wipe the gel on and it removes marine growth and tea stained gel coat with ease. Be sure to wash of with soap and water and re-apply wax as it strips any wax. The active ingredient is oxalic acid.
Mark
Maine whaler posted 03-04-2002 07:09 AM ET (US)     Profile for Maine whaler  Send Email to Maine whaler     
Thanks all. As usual, you folks are a great source of information.
Bigshot posted 03-04-2002 09:55 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
marykate's On/Off or lysol toilet bowl cleaner. On/off is potent.
hauptjm posted 03-04-2002 10:34 AM ET (US)     Profile for hauptjm    
Oxalic Acid. Dilute with water if you buy it pure (6 to 1). Star-Brite fiberglas cleaner is just diluted Oxalic. Don't rub, or waste your energy. Will bring back your original gel-coat color instantly. Neutralize with water quickly. Wet-sand may sound great, but you're removing gel-coat. This will do an even better job of removing the stain and won't hurt the gel-coat. It's the only way a quality yard will prep a hull with stains.

Note: it will remove ALL wax. You need to follow-up with a new good protective barrier of wax. Some like Meguirs or 3M Fineese it. Both are excellent products.

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