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Old 22-10-2020, 06:11   #1
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Plastic bag over prop, prevent growth?

Hi,
Iím leaving my boat at a dock for 3 months in a high growth area (Charleston, SC). Will putting a plastic bag over my props prevent growth? What about covering the props with grease or wax?
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Old 22-10-2020, 06:18   #2
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Re: Plastic bag over prop, prevent growth?

That’s the equivalent of closing the lid on a Petri dish.
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Old 22-10-2020, 06:50   #3
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Re: Plastic bag over prop, prevent growth?

I have actually heard of this, and the guy put some kind of a powder in the bag and sealed it up quick. I have no clue what it was, but it actually worked.
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Old 22-10-2020, 07:45   #4
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Plastic bag over prop, prevent growth?

We do this every summer (hurricane season) and it works very well. Not only does it keep the prop nice and clean, it keeps any hardshell fouling from getting in the cutless bearing.

Just make sure you donít use biodegradable bags!
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Old 22-10-2020, 08:02   #5
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Re: Plastic bag over prop, prevent growth?

The bags work, it protects your boat from dust and stuff.
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Old 22-10-2020, 08:14   #6
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Re: Plastic bag over prop, prevent growth?

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The bags work, it protects your boat from dust and stuff.
LOL
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Old 22-10-2020, 08:18   #7
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Re: Plastic bag over prop, prevent growth?

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The bags work, it protects your boat from dust and stuff.


The boats at a dock (not a dry dock &#129322
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Old 22-10-2020, 08:59   #8
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Plastic bag over prop, prevent growth?

Yes, the bags work. I just did this for 5 months in the Bahamas. The hull had a soft reef on it, but the prop was clean.

A heavy black bag and a pair of good zip ties is all you need.
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Old 23-10-2020, 10:07   #9
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pirate Re: Plastic bag over prop, prevent growth?

I would leave the boat for few months at a time in St Croix and putting a garbage bag around the prop saved me from issues with growth on the prop. When and if you do it, take all the air out of the bag, for extra protection against growing critters.
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Old 23-10-2020, 10:14   #10
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Re: Plastic bag over prop, prevent growth?

Quote:
Originally Posted by mrybas View Post
Hi,
Iím leaving my boat at a dock for 3 months in a high growth area (Charleston, SC). Will putting a plastic bag over my props prevent growth? What about covering the props with grease or wax?
You will be months past needing to have the hull cleaned, so why the concern about the running gear? You will need a diver regardless.
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Old 23-10-2020, 10:31   #11
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Re: Plastic bag over prop, prevent growth?

I have left my boat in Georgia at the dock for 8 years and every year I hired a diver to clean the hull and install a plastic bag for 6 months. It worked great, well worth it. The bag limits oxygen and there must be oxygen for growth. One year there was so much growth on the outside of the bag that it started to pull the bag off the prop. I would recommend having a diver check it every 3 to 4 mo.
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Old 23-10-2020, 10:32   #12
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Re: Plastic bag over prop, prevent growth?

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You will be months past needing to have the hull cleaned, so why the concern about the running gear? You will need a diver regardless.
While the hull will need to be extensively cleaned, a fouled prop provides no thrust - especially folding props. In an emergency, having a bit of thrust can ger you out of a jamb.
Dobít ask me how I know😬
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Old 23-10-2020, 10:37   #13
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Re: Plastic bag over prop, prevent growth?

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While the hull will need to be extensively cleaned, a fouled prop provides no thrust - especially folding props. In an emergency, having a bit of thrust can ger you out of a jamb.
The OP is leaving the boat at the dock. He won't be having any emergencies.
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Old 23-10-2020, 10:43   #14
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Re: Plastic bag over prop, prevent growth?

Hi Mike.
I have a bagged prop right now, I am on the dock recovering from a fukn heart attack, Can you believe it!


Make sure there is no void inside the bag. We bag and then lash it with twine so the plastic is tight on the metal. Wire an extra anode on there too...


When are we going to see you again?
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Old 23-10-2020, 10:49   #15
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Re: Plastic bag over prop, prevent growth?

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The OP is leaving the boat at the dock. He won't be having any emergencies.
An emergency, almost by definition, is something unexpected. Boat fire in the next slip over?

My lessons learned were at anchor. Two, to be exact. Thank the gods for roller furling head sails (staysail especially).

It is amazing to me how rapid growth is in La Paz Bay. Shallow water, heat, sun, poor water exchange and fertilization by treated, poorly treated., untreated sewage of nearly a quarter of a million people makes for extreme fecundity. Excess ag chemical fertilizer runoff may be even worse in well watered, more temperate waters. Itís a desert aqui, so little or no ag locally.
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