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Old 19-11-2019, 20:46   #1
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Antifoul on trailer sailer

Hi, I'm looking at buying a trailer sailer. The concern is that it's been moored in the past and antifoul applied to hull bottom. Is that a problem? Can I just leave it as is, or do I have to keep reapplying? Or should I remove it all? Then what? Repaint?
Or should I say "no thanks" and look for another trailer sailer?
Thanks
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Old 19-11-2019, 21:19   #2
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Re: Antifoul on trailer sailer

You're fine.

Is your launch deep enough to float the vessel off the trailer or do you need to slide/roll is off. If you can float off then there is no problem, I did so with my H260 many many times. Sliding my rub off some of the anti-fouling but you wont actually hurt anything.


Of course over time you will need to reapply, assuming you want to keep using the anti-fouling.
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Old 19-11-2019, 22:32   #3
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Re: Antifoul on trailer sailer

I'd rather not reapply and wont in the water more yhan couple of days at a time. Is there any harm in just leaving it?
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Old 19-11-2019, 23:16   #4
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Re: Antifoul on trailer sailer

It will not hurt the boat leaving the old antifoul on. It just looks terrible after a while. I have seen them painted below the waterline with two pack paint but it is a heck of a job removing all the old paint first.
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Old 20-11-2019, 12:03   #5
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Re: Antifoul on trailer sailer

Quote:
Originally Posted by amoret View Post
Hi, I'm looking at buying a trailer sailer. The concern is that it's been moored in the past and antifoul applied to hull bottom. Is that a problem? Can I just leave it as is, or do I have to keep reapplying? Or should I remove it all? Then what? Repaint?
Or should I say "no thanks" and look for another trailer sailer?
Thanks
Don't worry about it. If it begins to peel, pressure wash it.
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Old 20-11-2019, 12:51   #6
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Re: Antifoul on trailer sailer

Know that unless the hull is painted with an ablative paint, the existing paint will likely be rendered inert by prolonged exposure to air.
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Old 20-11-2019, 13:49   #7
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Re: Antifoul on trailer sailer

I would choose one of two options (Iíve used both):

1. Sand it all off, clean, touch up, wax and use no Bottom paint. Haul ever day or couple of days.

2. Sand it off, put on ablative paint and wipe/wash it every few days
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Old 20-11-2019, 14:22   #8
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Re: Antifoul on trailer sailer

Our trailer-sailor is at a slip in-freshwater most of the season, so I apply VC17 antifouling every spring. We trailer it somewhere once or twice a season; the trailer rollers might make a bare spot or two.

If you're only in the water a few days at a time, then a good clean finish plus wax should be fine, as suggested above.

When we first got the boat I stripped the bottom. Not a nice job, but not the worst either. The best thing I used was soy-based stripper - no fumes, not toxic or caustic, water-soluble. You paint it on in the late afternoon, let it sit overnight, then scrape off what you can, and finish with a power-washer or scrubbing while you spray with a hose. Some areas might take 2 or 3 passes. Take normal precautions with what you scrape/rinse off, cos that's toxic.
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Old 20-11-2019, 16:11   #9
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Re: Antifoul on trailer sailer

In my area I'd consider the paint a plus. Unpainted boats here get cosiderable growth in 7-14 summer days. Some of our trips are as long.
I'd leave the paint and splash on some fresh cheap when it became unsightly. Unless you're a racer it shouldn't hurt your speed much.

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Old 20-11-2019, 17:19   #10
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Re: Antifoul on trailer sailer

Quote:
Originally Posted by amoret View Post
Hi, I'm looking at buying a trailer sailer. The concern is that it's been moored in the past and antifoul applied to hull bottom. Is that a problem? Can I just leave it as is, or do I have to keep reapplying? Or should I remove it all? Then what? Repaint?
Or should I say "no thanks" and look for another trailer sailer?
Thanks
We had the same issue with our Bonito 22. Ours was generally kept in the water, but spent some time on the trailer, and after a few weeks dried out and started to crack and flake off. The solution was Coppercoat - rock hard two-pack epoxy with metallic copper powder in it. works very well as an antifouling and also impervious to abrasion and drying out - 10 years plus in or out of the water. ended up putting it on our keel boat too.

You will have to remove the old antifouling paint at some stage whatever you do. Perhaps that is a negotiation point/ Sodium hydroxide-based stripper works very well at doing that and does not affect your gelcoat.
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Old 20-11-2019, 17:23   #11
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Re: Antifoul on trailer sailer

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Originally Posted by Fore and Aft View Post
It will not hurt the boat leaving the old antifoul on. It just looks terrible after a while. I have seen them painted below the waterline with two pack paint but it is a heck of a job removing all the old paint first.
Cheers
Can be - we had ours soda blasted, but there is a very effective product from Peter G - 'Stripper for Antifoul'. works a treat. Broom it on in the afternoon, and pressure wash off in the morning.
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Old 20-11-2019, 21:19   #12
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Re: Antifoul on trailer sailer

The bigger issue might be what's under the anti fouling. If it has been on a mooring before, then it has the risk of water into the GRP & blisters if the gel coat is cracked anywhere. The anti-foul will hide this. If the boat looks in good everywhere else then you may be OK. Normal ablative antifoul does not like to be out of the water and if you reapply it prefers to go into the water again otherwise it will dry out and look terrible. My TY had all of these issues but it was a big boat at a good price and the rest of the hassles was worth the price and what I ended up with. I sanded back old antifoul and top layers of glass, as gel coat had already been removed by someone once before. I ground out many blisters then sealed with several layers of epoxy. I then had to finish coat it so I used Pettit Marine Vivid Antifoul, available here in OZ & I suspect would be in NZ too. It is designed to dry and cure hard but still has a degree of ablative anti foul properties. So far after 2 years on it is still good. I wanted a surface that would allow me to leave it in the water for a few months to go cruising then still be OK out and onto the trailer. Due for a recoat soon as its starting to look poor.
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Old 21-11-2019, 12:56   #13
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Re: Antifoul on trailer sailer

Great info ScottAus.

(and welcome to CF! )
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Old 21-11-2019, 15:36   #14
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Re: Antifoul on trailer sailer

The more I think about this the more I realise we have missed the big issue of the swing keel. Having been moored, does the swing keel still swing? I would be taking the boat to a travel lift and getting them to lift it so I can see the swing keel condition and in action.
David B is dead on the money with copper coat, hard finish and looks ok. Why have I never thought of that?
Cheers
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