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Old 07-11-2017, 12:17 PM   #1
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Faster easiest way to remove prop barnacles on the hard ?

Full size barnacles...a mess...on two 65 foot boat props that had no bottom paint.... Anyone with similar situation tried an oscillating chisel, like a Fein Multicaster with chisel attachment, for example ? A pneumatic chisel would shave 'em off like getting a haircut but got no source of compressed air where the boat sits now. Other ideas other than elbow grease ?

(and whatever the solution is, would like to avoid removing them to do it)
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Old 07-11-2017, 01:57 PM   #2
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Try Muriatic acid
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Old 07-11-2017, 02:03 PM   #3
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Five-in-one tool and then muriatic.
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Old 07-11-2017, 03:36 PM   #4
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Or grinder with nice wire wheel.
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Old 07-11-2017, 03:37 PM   #5
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Five-in-one tool and then muriatic.
Well yeah, that would work...but still wondering if anyone here has ever tried a powered chisel of some sort for this sort of thing.

I used a stand up pneumatic one once on a concrete floor that had dried fiberglass resin in many areas and it made night and day difference in the ease of getting that stuff off the floor compared to a manual chisel scraper.
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Old 07-11-2017, 03:39 PM   #6
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I would be afraid of gouging with a power chisel.
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Old 07-11-2017, 04:38 PM   #7
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Yep, not liking power chisel here. No needle gun either. Prop material too soft for those. Fein tool might work, worth a try.
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Old 07-11-2017, 04:45 PM   #8
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Even with major league barnacles a hand scraper usually removes all but the base, then muriatic acid or 120 grit small sander should bring you down to bare metal.
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Old 07-11-2017, 05:13 PM   #9
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Not sure why all the suggestions, dozens of marinas that I have either worked at, had my boat hauled at, or just hapoened to be there all use wire wheels.

Quick, easy, least amount of damage to the prop except acid wash......
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Old 07-11-2017, 05:21 PM   #10
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........ on two 65 foot boat props ..........
Those are some pretty big props!
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Old 07-11-2017, 05:34 PM   #11
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How exactly do you do that? I've used them in drills and wasn't real happy with the results. Is there a particular wheel or tool to use?
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Old 07-11-2017, 05:48 PM   #12
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How exactly do you do that? I've used them in drills and wasn't real happy with the results. Is there a particular wheel or tool to use?
Any tool will take some education and practice to produce good results. You've got your flat wheels and your cup wheels. You have your coarse wheels and you have your fine wheels. You have steel, stainless steel and brass wheels. Then you have your motor. I would think an angle motor would be easier to control than a hand drill.

Speed will have an effect on how well it works and how well you can control it. Also pressure against the surface.
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Old 07-11-2017, 05:50 PM   #13
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had a 39 Bayliner that we left in the water for 4 months and we thought would not be bad and just wanted to use it through the season
But duh

Used a 9 inch auto body disk grinder
What a B with everything flying everywhere after we knocked most of it off we used hand scrappers and smaller sander and some acid.
never again did I not have the bottom paint done.

have you tried a high pressure washer
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Old 07-11-2017, 05:51 PM   #14
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Okay. Back to 120 grit on a. Fein sander.
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Old 07-11-2017, 06:01 PM   #15
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How exactly do you do that? I've used them in drills and wasn't real happy with the results. Is there a particular wheel or tool to use?
I have a 4 inch Dewalt grinder.

For props I use about a 3 to 4 inch cup, stiff wire but not too aggressive.

It is my go to tool for grinding, sanding, wire wheelung, etc. Probably my most used tool after the drill and screw gun.
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Old 07-11-2017, 06:28 PM   #16
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Grinder for sure. Drill with wire wheel is tough for this amount of area.
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Old 07-11-2017, 07:28 PM   #17
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4.5" grinder with wire cup. Also double eye protection and dust mask.
Stay out of the line of fire.
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Old 07-11-2017, 08:06 PM   #18
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Long pants and long sleeved shirt. Those cups throw wires and its no fun on the receiving end.
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Old 07-11-2017, 08:20 PM   #19
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For what it is worth, I'll share my experience with marine growth on my underwater metals.

I could not beat the growth stuff no matter how I tried until lately. Once even took my props to a plating company and had them copper plated. No improvement. I have found though, that cleaning the metal and spraying it with zinc chromate to act as a binder for bottom paint works wonders. I recommend that hard bottom paint be used rather than ablative.

My shafts and props are almost clean at fall haul time using this approach.
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Old 07-11-2017, 08:50 PM   #20
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Have used Mary KayOn/Off; or Rydlime, with a wire brush. Results varied, but were generally good.
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