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Old 26 August 2018, 05:24   #1
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Which paint?

Wanting to repaint the inside and underside of my rib over winter. The boats never left in the water so donít need anti foul. Iíve used hempel deck paint before which worked prefect for inside but I canít find what paint to use for the underside? Every paint says itís not suitable for below the waterline.

Does anybody have any experience with this?
Would a waterproof deck/locker/bilge paint be suitable for below the waterline if the boats not kept in the water for long periods? Click image for larger version

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Old 26 August 2018, 06:25   #2
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Paints unsuitable for below the waterline basically means at least one of the following:

"This is not 100% waterproof"

"This is not suitable for adding anti-fouling over"

"This will scratch on a sandy beach"

Plenty of wooden sailing dinghies are painted with such paints - on the same basis - you aren't leaving it in the water.

Why do you want to paint it though? I've never seen a perfect finish on a deck paint.. but its meant to be "rough".

What is the paint hiding... cosmetically it will look better, but it won't remain cosmetically perfect.
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Old 27 August 2018, 04:48   #3
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Paints unsuitable for below the waterline basically means at least one of the following:

"This is not 100% waterproof"

"This is not suitable for adding anti-fouling over"

"This will scratch on a sandy beach"

Plenty of wooden sailing dinghies are painted with such paints - on the same basis - you aren't leaving it in the water.

Why do you want to paint it though? I've never seen a perfect finish on a deck paint.. but its meant to be "rough".

What is the paint hiding... cosmetically it will look better, but it won't remain cosmetically perfect.


The boats already painted underneath but hasnít been painted on thick enough so looks poor. Just needs tidying up basically. Iím not too fussed for the Ďfactory finishí paint job just something that looks smart on first impressions. The boats used and abused for wake skating but would be nice to have it looking abit smarter.

Any other methods of tidying it up?

Iím sure Iíve seen people on here before spray the underside before but couldnít find the posts.
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Old 27 August 2018, 05:10   #4
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I'd like to know this also as I had some damage fixed on my boat and it now has grey antifoul area on a white hull. The whole hull could do with a new paint job to smarten it up but all I get from people is, it can't be painted with anything. Surly there is some white marine gloss paint somewhere one can buy?
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Old 27 August 2018, 06:35   #5
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Grey antifouling? As a patch...? Something not right
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Old 27 August 2018, 07:45   #6
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Grey antifouling? As a patch...? Something not right
No, there was a repair done properly but they only had grey antifoul to paint on, they had run out of white so the patch area was painted grey. I'd prefer grey than nothing at all but it just looks unsightly.
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Old 27 August 2018, 07:51   #7
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BigE - if you need antifouling (i.e. the boat stays in the water > ?10 days at a time) then you presumably re-paint the AF from time to time (it wears away).

So next time you are repainting the AF it is sorted.

If you don't need AF - then you'd need to strip the AF off before you could think what else to put on, or possibly nothing (although to AF - people usually rough up the gel coat to get it to stick and so it will probably need something...
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Old 27 August 2018, 07:57   #8
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Thanks, indeed it spend April >- October on the water so it does need new anti foul. That will be my job in March/April next year.
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Old 27 August 2018, 07:59   #9
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The boats already painted underneath but hasnít been painted on thick enough so looks poor. Just needs tidying up basically. Iím not too fussed for the Ďfactory finishí paint job just something that looks smart on first impressions. The boats used and abused for wake skating but would be nice to have it looking abit smarter.

Any other methods of tidying it up?

Iím sure Iíve seen people on here before spray the underside before but couldnít find the posts.
I think that is fundamentally an issue with painting on gel coat. If this was bare wood - you'd have at the very least a layer of primer (maybe 2) and then 2 or 3 (maybe 5) layers of paint. People skimp on the paintwork on gel because it isn't to protect the wood, it is just cosmetic.

The "proper" thing to do is to strip all paint off and re-finish the gel with new gel/flow coat. Good luck getting an acceptable finish! I believe it is possible to spray it... You need some serious facilities to do that though.

The next best thing is to strip it all back and prime and paint it with a 2 pack paint (over a 2 pack primer) which could be sprayed with the right equipment and protection. Plenty of yachts do that then AF over the but in the water. BUT - yachts try to avoid parking on beaches etc. I have my doubts about the longevity of it in true abrasive places

If all you want to do is tart it up then any exterior 1 pack gloss will work on well keyed surfaces - but it will need re-doing regularly.
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Old 27 August 2018, 08:00   #10
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Thanks, indeed it spend April >- October on the water so it does need new anti foul. That will be my job in March/April next year.
Your case is much simpler that Luke's then.

If you really wanted to you'd just scrape back the grey (careful - AF is toxic) and repaint a patch with white AF...
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