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antifouling touch-up or redo?

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nicholass View Drop Down
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    Posted: 29 May 2023 at 18:14
Hi all,

Soon I will be dry docking my Hanse 455 for a long weekend to do the antifouling with a friend. I don't have any experience doing this myself, and I hear conflicting things.

It was done extensively in May 2022, and has been in the Med since in the water.
There is mostly only a slimey layer on the hull which comes off pretty easily, and some spots are even unaffected. Of course some barnacles here and there. 

Should I high pressure clean it all off and do it completely over with primer + antifouling

or

clean it (with low pressure water i presume) and touch-up?

Thanks in advance and good health!

Nicholas
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Arcadia View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Arcadia Quote  Post ReplyReply Direct Link To This Post Posted: 30 May 2023 at 01:38
No primer is needed after the first coat is on. However, you should us the same type of paint on future coats especially if it is working well. It sound like it is in good shape, so power wash and scrape the barnacles for now and touch up if needed. If you want to be sure, you can roll one thin coat with a gallon of the same paint and it will take an hour or so. 
Leon / ARCADIA
2018 Hanse 588
Sag Harbor, NY
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415 Singapore View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 415 Singapore Quote  Post ReplyReply Direct Link To This Post Posted: 30 May 2023 at 10:53
Hi, I agree with Leon, sounds like your anti fouling is working well. Don’t worry about high pressure hose, unless ridiculously high, if the paint was put on properly in the first place high pressure cleaning will not damage it. I would reiterate Leon’s point about using the same paint as previously applied
All the best
Paul
Paul - Night Train - 415 #136
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wayne's World Quote  Post ReplyReply Direct Link To This Post Posted: 30 May 2023 at 14:03
Nicholas,

It is unusual that a antifouling paint available in and conforming to EU regulations would last longer that 12 months unless the boat had been kept out of the water for a extended period of time over that period. So although your current antifouling appears to be working well now it is likely to stop working sooner than later.

There are two general types of antifouling paints (ignoring Coppercoat and the Teflon types) which are "soft" and "hard". Soft includes self polishing and ablative paints which wear away as the boat travels through the water. 

The hard type paints leech their toxin out over a period. You need to know which type you have on now and use the same type again. As your existing paint seems to be working you need to find out what type and brand it is from the previous applicator or your dealer. 

If the boat is pressure washed a soft antifouling will be mostly taken off in the process. A hard antifouling generally will not. All growth needs to be removed before repainting. Any areas where the primer has been worn through or damaged needs to be primed again. The whole area needs to be lightly sanded (80 grit) to give the new paint a better key to adhere to. The general process it to apply one stripe coat of antifouling to the high wash areas - water line, front of keel and rubber. Then apply two coats over the complete surface making sure you keep to the manufacturers recoat periods and prep and applicationinstructions. 

There are probably many Youtube videos on reapplying antifouling and some paint manufacturers are likely to have instructional videos on their websites. The effectiveness of either the soft of hard antifoulings is related to the applied thickness of the paint which is why multiple coats are generally applied for a year of service.

Keep in mind that these antifouling paints are toxic so make sure you wear the appropriate PPE when sanding or applying these paints.



 
Wayne W
Cruising, currently in the Caribbean and will head across the Pacific early 2024
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nicholass View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote nicholass Quote  Post ReplyReply Direct Link To This Post Posted: 30 May 2023 at 19:12
Thanks a lot for the replies!

It is a soft paint, as it comes off easily even while rubbing it gently with your hand.
I asked the boatyard (in France) that did the previous anti-fouling what they used, still waiting for their reply.

I will see what happens when I pressure wash it.
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landlocked View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote landlocked Quote  Post ReplyReply Direct Link To This Post Posted: 31 May 2023 at 01:47
Mine is CSC Micron ablative paint and for that I think the best treatment is pressure washing followed by wet sanding, and let it dry for a day before painting.  The wet sanding helps the adhesion of the next coat, as does the drying period.  Wet sanding is just scrubbing with a wet abrasive pad on a pole.  Keeping it wet keeps it from generating toxic dust.
"Kerkyra" 400e #042
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 415 Singapore Quote  Post ReplyReply Direct Link To This Post Posted: 31 May 2023 at 05:18
Hi, we use International Micron Extra 2 which is ablative or 'soft' anti fouling. Stands up to a pressure wash fine, as Landlocked says wet sand it and let it dry. Ours usually lasts about 2.5 years or so between lift outs, albeit with bi-monthly dive cleans to remove the algae
Good luck
Paul
Paul - Night Train - 415 #136
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