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Old 16-06-2007, 13:29   #1
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Bottom Paints

Jeez I never thought applying bottom paint would be such an issue.

So I bought a hard bottom paint, with lots of copper and anti algae stuff. West marine BottomPro Gold is the name of the stuff. I was not sure what to use.. becuase I have always sailed in freshwater, where the boat is only in the water for a few months in the summer. I don't like the prospect of having to sand off the bottom paint each time I want to recoat, which aparently is what is reccomended for hard bottom paints. but i don't want to apply something that is soft and will wear away too fast in a warmer salt water environment (i'm heading down to South Carolina). So what is a good bottom paint for that area? how often do you haul out your boat and paint the bottom?

If I have the right stuff, should I sand off the VC-17 that is currently on the boat before I apply the BottomPro?

Thanks.
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Old 16-06-2007, 14:49   #2
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If you had VC-17 on the boat, why did you change paints ? I just finished removing 17 layers of paint. Tomorrow I start on my epoxy finish with silica. I plan on applying 3 coats. I am going to use the Vivid paint this year, the bright yellow. You'll know when I keel over.
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Old 16-06-2007, 15:45   #3
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Aloha Chad,
Sounds like a lot of hard work. I used a hard paint Pettit Trinidad Red and didn't sand the previous paint off. It stuck just fine and last 2 years with not problem. I just hauled out 3 months ago, sanded the hardened scum off and put another coat of the same paint on and is doing just fine.
Paint manufacturers don't want you to deviate from their directions because they can't be liable for the performance of a paint that was under theirs. They also can't guarantee its compatability or how well the previous coat will keep adhering to the hull. That's why they want you to start fresh.
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Old 16-06-2007, 16:13   #4
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Just a thought along similar lines, I have an aluminium hull and have used International Trilux, recommended as the best of a bad lot, it is a hard antifoul and is aimed at faster hulls than mine. Does anyone have experience of something better.
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Old 16-06-2007, 21:11   #5
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I am changing from VC-17 because it is not reccommended for year round submersion, or warm saltwater.
The bottom paint I have says it is applicable over hard bottom paints. Vc-17 doesn't say whether it is hard, or soft, which is why i'm not sure on the proper course.
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Old 17-06-2007, 06:56   #6
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Bottom paint can be quict specific to what you are going to be using the boat for. How long are you going to be keeping it in salt water?
Are you going to dry dock the boat for more than 1 month during the next year?

The Pettit Trinidad Red should last for 3 years. You may need to add some stuff for local conditions. If your boat is not moving much during the month you would want the hard paint.
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Old 17-06-2007, 10:23   #7
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Chad,

Nothing will stick to a VC17 bottom except VC Offshore because of the teflon in VC17. The first time I went south I had VC17 which is a very popular bottom paint in the Great Lakes. It had to be wiped off with acetone in the Chesapeake before I could change paints. The easiest approach for you would be VC Offshore. I have had friends that used it and it stood up pretty well in a trip to the Bahamas. Myself, I have gone back and forth between hard and ablative paints. My last experience with Pettit Trinidad SR (a hard paint) was not the best so I have again gone back to ablatives (Ameron). Ameron is half the price as CSC or WM ablatives and has the same copper content.
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Old 17-06-2007, 14:25   #8
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The use of "Gwalarn" is coastal cruising with the possibility of going to Tonga / Fiji next southern winter. The anual haulout is for re-antifouling / checking the aluminium indium annodes etc. An interesting aside from an International paint rep regarding the Trilux that I am currently using is that it needs 30 days to cure before achieving its most effective performance. Of course this was after we had launched 3 days after the last coat was applied and was 3 months into the spring sailing season and the barnacles were already appearing in worrying numbers. Trinidad antifoul which is I believe made under license here in NZ was taken of the shelves by one retailer that I use as not living up to the promo material. 3 years from an antifoul would be a dream coming true, but I wont hold my breath.
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Old 17-06-2007, 22:35   #9
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Chad,
I clean boat bottoms for a living and in my experience, Petit Trinidad is as good an anti fouling as you can buy. As you noted, VC 17 is not designed for use in saltwater in addition to the fact that it is not compatible with a modified epoxy paint, so yes, you will have to remove it before applying the Trinidad but you will not have to sand the Trinidad off each time you haul for paint. Epoxy paints do build up over the course of time, but you may not need to remove all the old paint for many seasons. Also, ablative paints are not superior to epoxies, IMHO, and have several significant drawbacks. I think that if you are keeping the boat in a high-fouling environment that necessitates frequent hull cleaning, you will be happy with the Trinidad.
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Old 18-06-2007, 22:56   #10
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Quote:
Originally Posted by chad.lawie
I am changing from VC-17 because it is not reccommended for year round submersion, or warm saltwater.
The bottom paint I have says it is applicable over hard bottom paints. Vc-17 doesn't say whether it is hard, or soft, which is why i'm not sure on the proper course.
It's hard. I use it on my trimaran which is in the water year around. I'm in the Pacific Northwest where water temp is around 48 degrees F. It's getting weak on its third year.
It is supposedly compatible with previously applied vinyl paint, although I went down to the hull before application.

Steve B.
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Old 18-06-2007, 23:36   #11
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Thought I would throw in my .02 cents in here. When I purchased my Ingrid, I had no idea what was on the bottem. It look terrible! I though I had fiber-glass blisters too. I have always used Petit Trinidad red with great success. When I applied it, it began to blister up the paint underneath it. A year later I tried sanding a couple of coats down. I found that what I thought were fiber-glass blisters, were actually blisters between bottom paint layers...weird! I think the first couple of original coats are causing this. I was going to Mexico this year to have the bottom stripped and epoxied and start fresh. As a few of you know, I snapped a tender off my bicep muscle on my right arm, so no manana this year.
Maybe someone knows why my new paint is reacting with the old stuff...Aloha
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Old 19-06-2007, 05:48   #12
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This was recommended in practical sailor long ago. I have used it several times and like it. It can be painted over ANY paint and will last a season or more with one coat. Also can be left out of the water awhile without harming the effectiveness. It can only be bought from the compa y that makes it, They ship it for $135 a gallon (May07)

Super Shipbottom Hard Ablative Antifouling Bottom Paint
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