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Go Back   SailNet Community > On Board > Gear & Maintenance > Removing Bottom Paint
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Thread: Removing Bottom Paint Reply to Thread
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Topic Review (Newest First)
1 Hour Ago 03:12 AM
casey1999
Re: Removing Bottom Paint

Quote:
Originally Posted by barefootnavigator View Post
I'm very confused by this thread. I use one coat of ablative every three years COLD water. I never clean it, when the boat moves all growth falls off. at the end of three years it is still going strong I am very happy with the paint I think its west marine gold plus but I would have to look at my log to be sure. I'm taking the bottom down in the fall to re do my old barrier coat and moving the boat to the tropics, hard or soft??? if you answer please add your location.
Everyone in my harbor, north shore Oahu uses ablative. This includes charter fishing boats that run 100 miles a day, private power fishing and pleasure and commercial sail. I looked into the hard paint and the problem I saw with it is it only last for a few years then you have a labor intensive removal problem before recoating. Ablative should wear away over the years and therefore not so much paint to be removed. Our harbor is close to a river outlet so we get a lot of growth because of the high nutrients. Barnacles can grow 1/2 thick in two. Most folks here like the ameron or the Petit Trinidad. Seeing commercial container ships and navy use ameron, must be something good about it.
7 Hours Ago 09:50 PM
barefootnavigator
Re: Removing Bottom Paint

I'm very confused by this thread. I use one coat of ablative every three years COLD water. I never clean it, when the boat moves all growth falls off. at the end of three years it is still going strong I am very happy with the paint I think its west marine gold plus but I would have to look at my log to be sure. I'm taking the bottom down in the fall to re do my old barrier coat and moving the boat to the tropics, hard or soft??? if you answer please add your location.
7 Hours Ago 09:20 PM
casey1999
Re: Removing Bottom Paint

SCNOOL:
Can you provide a link to a real random orbit sander- hopefully one I can attach my shop vac to.
Thanks
9 Hours Ago 07:54 PM
travlineasy
Re: Removing Bottom Paint

The absolute fastest, easiest way I've come across to remove bottom pain is to use a dryway screen sander. I had one attached to a wooden pole, sanded the bottom of a 27 catalina in less than three hours, the finish was incredibly smooth and because you dip the screen into a bucket of water, to clean it, the entire job was fairly clean as well.

You can purchase drywall screen sanders at Home Depot, Lowes, Amazon, etc... for under $10. They are made by 3-M

Gary
14 Hours Ago 02:59 PM
SHNOOL
Re: Removing Bottom Paint

It all depends on your water/situation...
I bought my boat from someone who kept his boat in saltware, who opted for ablative (worked for him).. he touched up year on year, and every 3 years or so, roughed up the bottom paint, and added a layer...

When I got the boat, intending on racing it on a freshwater lake, I intended to remove all the ablative and fix any blisters, barrier coat, and add new hard bottom paint, specifically VC17m. Its not BETTER, just better for my use.

Best method I used to remove the bottom paint was a regular old house scraper, sharpened diligently, and used perfectly flat against the hull. It removed all 8 visible layers of ablative, the last layer seemed to be red ablative over white barrier coat. I then sanded the barrier coat to get a smooth surface, patched the few blisters I found, and barrier coated again.

This is what I started with:


This is after about 30 man-hours of hand scraping. Note, there is a HUGE difference between finish sanders (random orbit) and true sanders (random orbit)... that's a later discovery.


This is after sanding (with a stupid finish sander, see statement above) at 80 grit.
I also started to fair the keel in this picture.


After more sanding, more fairing, then, Barrier coat going on...


Several layers (I think 3 or 4) of barrier went on, with light sanding with 200 grit between... before I finished... then I applied 3 layers of VC17m in alternating colors.


For a dramatic effect, one can also do topsides and boot stripes...
14 Hours Ago 02:24 PM
gah964
Re: Removing Bottom Paint

Quote:
Originally Posted by casey1999 View Post
Agree.

Here is my story. 5 years ago when I bought the boat, I hauled it and sanded with 60 grit to try to remove the bottom paint. After two days there was still many layers of ablative bottom paint on the hull. It would have been nice to get it all off but I was out of time. I painted 3 coats of Ameron ABC 3 ablative bottom paint on the hull and launched. After 5 years the Ameron was still performing well, except mainly along areas towards the bottom of the lead keel. I think this was a lead/prep/ primer issue and not the bottom paint. When I hauled the boat the Ameron bottom paint was still in good shape. The hull was water blasted. If I wanted, I could just lightly sand the remaining Ameron and repaint. However just trying to get some of the many layers of previous paint off. I am satisfied with the ablative bottom paint. Seems if you use your boat somewhat regularly the paint will "ablate" as it is supposed to and after 5 or more years, there will not be much sanding required on haul out.
my bottom has been scraped now for two yeas now every 3 moths and it looks like new.HARD PAINT yes that is correct.
14 Hours Ago 02:21 PM
gah964
Re: Removing Bottom Paint

Quote:
Originally Posted by casey1999 View Post
When I did dive the boat to remove slime off the bottom paint, I used a piece of soft carpet. You do not want to scrape the ablative paint off- the paint is your protection from growth. I am in a heavy slime area and would dive the boat on average about once every 6 months. Maybe you are in a different situation.
yes i have barnicals in 3 months but if you get 6 months and just get slim why in the world would you want ablative? thats what is gumming up the sand paper ablative paint. hard paint is so much easier to sand off i am so glad i got ride of that crap now i use 12 pads and repaint.people are being fooled by the paint company's they get their information from the paint company and fall for it. i have done many bottoms and i will never be fooled again.
16 Hours Ago 12:59 PM
casey1999
Re: Removing Bottom Paint

Quote:
Originally Posted by gah964 View Post
i got tired of diving my boat and scraping the ablative off i am very happy not scraping the hard paint off now after two years still holding great. PS i misspoke about the antifouling sorry boss what ever you say.
When I did dive the boat to remove slime off the bottom paint, I used a piece of soft carpet. You do not want to scrape the ablative paint off- the paint is your protection from growth. I am in a heavy slime area and would dive the boat on average about once every 6 months. Maybe you are in a different situation.
16 Hours Ago 12:56 PM
casey1999
Re: Removing Bottom Paint

Quote:
Originally Posted by fallard View Post
The previous post confuses ablative and hard bottom paints. Both are anti-fouling, but the hard paints are single season. The ablative paints are multiseason and typically don't wear down a coat every year. With the application of several coats of an ablative bottom paint you should get several years before needing to recoat, whereas the hard bottom paints need to be recoated every year.

If you are stripping the bottom paint, you should apply several coats of ablative antifouling paint within the recoat times following the application of a barrier/primer coat. That way you can avoid sanding between coats. The bottom line is that you can save an annual sanding by using mulitple coats of ablative bottom paint. I went 5 years without recoating on one boat. There's a fellow at the boatyard that is starting his fifth year without a recoat, so my experience is not unique. That's less than one coat per year.

On the other hand, if you use hard bottom paints, you will be sanding every year before an annual recoat of hard antifouling paint.
Agree.

Here is my story. 5 years ago when I bought the boat, I hauled it and sanded with 60 grit to try to remove the bottom paint. After two days there was still many layers of ablative bottom paint on the hull. It would have been nice to get it all off but I was out of time. I painted 3 coats of Ameron ABC 3 ablative bottom paint on the hull and launched. After 5 years the Ameron was still performing well, except mainly along areas towards the bottom of the lead keel. I think this was a lead/prep/ primer issue and not the bottom paint. When I hauled the boat the Ameron bottom paint was still in good shape. The hull was water blasted. If I wanted, I could just lightly sand the remaining Ameron and repaint. However just trying to get some of the many layers of previous paint off. I am satisfied with the ablative bottom paint. Seems if you use your boat somewhat regularly the paint will "ablate" as it is supposed to and after 5 or more years, there will not be much sanding required on haul out.
1 Day Ago 09:42 PM
gah964
Re: Removing Bottom Paint

Quote:
Originally Posted by fallard View Post
The previous post confuses ablative and hard bottom paints. Both are anti-fouling, but the hard paints are single season. The ablative paints are multiseason and typically don't wear down a coat every year. With the application of several coats of an ablative bottom paint you should get several years before needing to recoat, whereas the hard bottom paints need to be recoated every year.

If you are stripping the bottom paint, you should apply several coats of ablative antifouling paint within the recoat times following the application of a barrier/primer coat. That way you can avoid sanding between coats. The bottom line is that you can save an annual sanding by using mulitple coats of ablative bottom paint. I went 5 years without recoating on one boat. There's a fellow at the boatyard that is starting his fifth year without a recoat, so my experience is not unique. That's less than one coat per year.

On the other hand, if you use hard bottom paints, you will be sanding every year before an annual recoat of hard antifouling paint.
i got tired of diving my boat and scraping the ablative off i am very happy not scraping the hard paint off now after two years still holding great. PS i misspoke about the antifouling sorry boss what ever you say.
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