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Old 07-06-2017, 07:52 PM   #1
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Bottom paint necessary?

Have a '77 CHB in Marina in SoCal, never go out. Paint has deteriorated to poor, have been told gelcoat is very thick and not to bother re painting. Have it cleaned monthly.
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Old 07-06-2017, 08:05 PM   #2
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Greetings,
Welcome aboard. If your diver is fine with scraping and is not requesting painting to make his job easier, leave it the way it is. I don't think anti-foul has anything to do with gelcoat preservation other than your diver may damage the gelcoat since he has to scrape harder to remove growth. My .$02.
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Old 07-06-2017, 11:34 PM   #3
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What is the diver cost per year vs painting. ?
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Old 07-07-2017, 07:38 AM   #4
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If you never go out why bother with a diver??
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Old 07-07-2017, 07:47 AM   #5
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Paint the bottom. The gelcoat will eventually be eaten through to the glass.

If you ever want to sell it - that will be a factor.

Here is what it will look like (from a boat I had surveyed a couple of years ago).
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Old 07-07-2017, 08:21 AM   #6
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Quote:
Originally Posted by mcrandop View Post
Have a '77 CHB in Marina in SoCal, never go out. Paint has deteriorated to poor, have been told gelcoat is very thick and not to bother re painting. Have it cleaned monthly.
Never go out or seldom go out? If you never go out, why bother with a diver. Just let the barnacles build up like they do on the docks. A 40 year old boat can't be worth much and will probably go to the scrap heap when you are done with it.

Rather than asking people on the Internet, ask your diver if it needs to be painted. Ask other boaters in your marina what they do. Compare the cost of a haulout and bottom paint job to the value of your boat and how much longer you would like to keep it.

Personally, I leave my bottom paint until my diver starts complaining and then have it repainted. You can take that as advice or not.
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Old 07-07-2017, 08:43 AM   #7
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Menzies:
Are you saying that marine growth can actually cause delamination of a FG hull? The hull shown looks like FG laminated over wood??
Would not have expected any damage other than increased build-up of marine growth.
A past dock neighbor left the bottom of his Marine Trader 44 unpainted for years. It was a real mess when it was hauled but no permanent damage when he finally decided to paint the bottom and go cruising.
Given the comments about going to the junk yard, and the give-away value of the old boat, why bother to do anything??
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Old 07-07-2017, 08:56 AM   #8
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"Given the comments about going to the junk yard, and the give-away value of the old boat, why bother to do anything??"


If the boat in question has limited value to the owner and never will run on its bottom and that is OK with the marina then you can ignore all of the following:
- bottom
- running gear
- engines
- genset
- etc


If on the other hand the OP wants the option of going out on the boat some day or selling the boat for some reason then minimal maintenance will be a better path. Pay me now or may me later tends to work in this case.
FWIW - Out here where we are in the NE a boat that cannot move under its own power is very often not allowed at local marinas and will deal with problems associated with that condition.
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Old 07-07-2017, 11:08 AM   #9
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As Chrisjs points out that picture is a glass sheathed wood hull, and lightly sheathed at that. It is not a solid fiberglass hull. The chance that having the hull scraped by a diver frequently over many years might wear away the gel coat is just about 0%.
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Old 07-07-2017, 11:26 AM   #10
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If you never go out why bother with a diver??
Yes - a very good point. It will also avoid the inevitable deep scratches in the hull from excessive scraping and the ever increasing fees from cleaning a really fouled hull.
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Old 07-07-2017, 02:50 PM   #11
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Menzies:
Are you saying that marine growth can actually cause delamination of a FG hull? The hull shown looks like FG laminated over wood??
Would not have expected any damage other than increased build-up of marine growth.
A past dock neighbor left the bottom of his Marine Trader 44 unpainted for years. It was a real mess when it was hauled but no permanent damage when he finally decided to paint the bottom and go cruising.
Given the comments about going to the junk yard, and the give-away value of the old boat, why bother to do anything??
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As Chrisjs points out that picture is a glass sheathed wood hull, and lightly sheathed at that. It is not a solid fiberglass hull. The chance that having the hull scraped by a diver frequently over many years might wear away the gel coat is just about 0%.
No, I'm saying that the gelcoat can be eaten through. Not necessarily that the laminate is damaged. Though having the laminate exposed in salt water for years can't be good. Otherwise why would we care about blisters?

2003 Seahorse 53.

From the survey: "Construction is un-cored fiberglass laminate with gelled and cored top sides."
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Old 07-07-2017, 04:54 PM   #12
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How would the gel coat be eaten through?
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Old 07-07-2017, 04:56 PM   #13
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If you never leave the marina and don't care about the boat's bottom condition, then you needn't worry about protective bottom paint.
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Old 07-07-2017, 06:34 PM   #14
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Honestly this is really freaking me out. I would never not bottom paint. Worth of a boat is determined by its worth to the owner. Although my boat is a 1986, the work put into her, restoring her is priceless to me. Why would I not bottom paint? I have a diver go down once a month. I just had it painted a month ago.
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Old 07-07-2017, 06:53 PM   #15
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Honestly this is really freaking me out. I would never not bottom paint. Worth of a boat is determined by its worth to the owner. Although my boat is a 1986, the work put into her, restoring her is priceless to me. Why would I not bottom paint? I have a diver go down once a month. I just had it painted a month ago.
I'm with you.

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Old 07-07-2017, 08:26 PM   #16
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I have no idea for sure that paint helps a bottom, or not

In my boats case, it sat in a Ft Lauderdale canal for 25 years....in warm water.

The owner was a dive instructor, so the bottom was rarely painted but often scraped by students.

When I bought tbe boat, tbe bottom didnt appear poor, but adter some grinding, the gel coat looked like swiss cheese, the mat underneath was dry and could be pulled off by hand, and karge sections of laminate were hydrolyzed.

Cant say why the bottom rotted off, but that was its history...one I will never repeat.
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Old 07-07-2017, 08:33 PM   #17
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Just how many wood-hulled boat were sunk or given up due to sea worms? More than one can count over the centuries?
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Old 07-08-2017, 05:25 AM   #18
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I have seen a large plastic sheet pulled under a stored boat with all the edges pulled above the water.

Clorox or similar was dumped in the created pool and nothing grew on the hull.

For a liveaboard a sink discharge would require a piece of hose to go beyond the pool.
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Old 07-08-2017, 05:33 AM   #19
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I would suggest the hull be spray coated with hot tar its quick and cheap to apply .I know of barges that have been treated this way and it lasts for 5 years
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Old 07-08-2017, 08:53 AM   #20
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We shouldn't confuse antifouling paint with a barrier coat. A barrier coat protects the fiberglass from osmosis and blistering. Antifouling paint makes it harder for marine growth to adhere to the boat's hull, barrier coat or not.
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