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Author Topic:   Barnacles
credditt posted 06-06-2002 08:49 PM ET (US)   Profile for credditt   Send Email to credditt  
I have A LOT of barnacles (dried) on the hull of my Dauntless 13'. They scrape off easily, but the "glue" that they leave behind is still there, leaving a rough hull surface. What's the best way to get the hull nice and clean and smooth again? Thanks, Christian
JohnAz posted 06-06-2002 10:28 PM ET (US)     Profile for JohnAz  Send Email to JohnAz     
buy a new Whaler,,,,,,,,,,,,,,,,,,,,
try lime away
Bill C posted 06-07-2002 06:45 AM ET (US)     Profile for Bill C  Send Email to Bill C     
Try muriatic acid, a mild version of hydrochloric acid. Available at your friendly pool supply. Use a spray bottle and gloves. Don't use in a closed area as the fumes will knock you down. May take several tries. The stuff you are trying to remove is calcium carbonate based so will bubble when hit with the acid. Rinse well and dry between applications. Use a 3M bottom scrubber to remove the loosened "glue". Should produce a smooth bottom. Has worked for me on several boats. Also great stuff for toilets if you have hard water which is the only kind here in Florida. I use a quarter cup in the john and leave overnight. Swish around and flush.
Soho posted 06-07-2002 07:38 AM ET (US)     Profile for Soho  Send Email to Soho     
I can second the Muriatic Acid suggestion, works wonders on barnacles. As noted, be very careful of the fumes.
fd3 posted 06-07-2002 08:18 AM ET (US)     Profile for fd3  Send Email to fd3     
Also, don't do it while the boat is on the trailer. It will do ugly things to most parts of a trailer.
where2 posted 06-07-2002 12:26 PM ET (US)     Profile for where2  Send Email to where2     
If you had no intention of using the hull for 3-4 months, then flipping it over and letting the sun bake on it works REALLY well. I picked up a couple of fiberglass floating docks that had been top side down for some time, coating them with a uniform layer of 3/4" barnacles. After righting them and using a large flat chisel to get the big stuff off, the sun slowly baked the barnacle bases loose. My only explaination has to do with different coefficients of expansion for gelcoat and barnacles.
Bigshot posted 06-07-2002 12:43 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
get yourself a Sheepshead or Parrot fish. They eat barnacles and coral.

Acid or MaryKates "On/Off will do the job. Fumes will take your breath away....maybe permanently:)

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