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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)
2 Weeks Ago 09:10 PM
fallard
Re: Removing Bottom Paint

Confession: my other boat is a 23' stinkpot, which I've had for 24 years. It has stepped hard chines. Something like Rhapsody-NS27's lapstrakes but only a very few. I stripped the built up bottom pain a few years ago using a carbide scraper and cleaned things up with a random orbital sander using 80 grit discs before applying Interlux 2000 and then the bottom paint.

There are variants of the carbide scraper, including one that comes with a 1" triangular blade (3 edges). That one can also accommodate a 1" round carbide blade that you can draw along the inside of the ridges to catch what's in the corners. You might also try using the sander and run the 1/8" or so of paper that overhangs the sanding pad to see if that is sufficient to remove the stuff in the corners. I found with my power boat that the straight scraper got pretty close (but you need to be careful not to gouge) and the sander got the rest. That job went much easier than I had hoped.

Hint: you need to apply enough pressure against the bottom to fracture the old bottom paint. If you are shaving the bottom paint, you are making a lot more work for yourself.

Another point: I just had the bottom of my sailboat blasted with walnut shells. This is a very technical procedure if done properly and is usually done as a package deal where the blaster comes in and tapes everything off (waterline, any paths for the dust to intrude where it's not wanted). They handle everything including the tenting of your boat to contain the considerable dust and then clean up after themselves. It isn't cheap, but the results are impressive. I would never consider sandblasting-or even soda blasting-after seeing the results with walnut shells. The hull is very smooth and retains a "blush" of residual bottom paint that is easily removed with an orbital sander (not part of the blasters job). Cleaning up the blush in preparation for the barrier coat means 80 grit paper and looks like about a 6-8 hour job for my 35 footer, including under the poppets.
2 Weeks Ago 03:46 PM
gah964
Re: Removing Bottom Paint

Quote:
Originally Posted by Rhapsody-NS27 View Post
I think some of you doing the bottom work yourself should be glad you have smooth hulls.

I'm still in the process of removing the bottom of my boat. With its lapstrake style hull, there are a lot of ridges that require a little more effort to scrape off. Some spots are fairly easy but others are a pain to remove. The smooth parts are about 4 inches wide between the ridges. I haven't had the boat for very long so this is the first time I'm doing this.

Attached are a couple pictures of how it's going.
i wonder if you could use a sand blaster for the hard to reach places?
2 Weeks Ago 10:16 AM
Rhapsody-NS27
Re: Removing Bottom Paint

I think some of you doing the bottom work yourself should be glad you have smooth hulls.

I'm still in the process of removing the bottom of my boat. With its lapstrake style hull, there are a lot of ridges that require a little more effort to scrape off. Some spots are fairly easy but others are a pain to remove. The smooth parts are about 4 inches wide between the ridges. I haven't had the boat for very long so this is the first time I'm doing this.

Attached are a couple pictures of how it's going.
2 Weeks Ago 09:30 AM
BarryL
Re: Removing Bottom Paint

Hey,

I went through this back in 2008. I NEVER want to go through it again.

I documented my project here:

http://www.sailnet.com/forums/gear-m...done-test.html

Barry
2 Weeks Ago 08:58 AM
fallard
Re: Removing Bottom Paint

As a fellow boater admonished me when I was contemplating stripping my bottom paint by hand, "One of your tools is your checkbook!"

I normally do things myself, but this time I gave in. I'll do the clean up sanding myself and then apply the barrier and antifouling coats myself, but it was a relief to have the bottom paint professionally removed and all the toxic waste properly handled.
2 Weeks Ago 08:15 AM
Minnewaska
Re: Removing Bottom Paint

What removes bottom paint the best?

Money.
2 Weeks Ago 07:55 AM
fallard
Re: Removing Bottom Paint

To casey1999's question about a random orbit sander: I've used several over the years and have had really good results with a "DEWALT D26451 3-Amp 5-Inch Random-Orbit Sander with Cloth Dust Bag", currently available on Amazon and elsewhere. I am also currently sanding my gelcoat after the walnut shell blasting than occured earlier this week.

You need to use perforated sanding disks and attach a shop vac hose in place of the cloth bag. For those who haven't figured it out, you need to change your sanding disks frequently--as soon as the sharp "tooth" fades. Your work will go a lot faster. I expect that I will probably use about 25 80 gritdisks to do the bottom of my 35 footer at a cost of $15. Note that I am only removing residual bottom paint that could be compared to "5 o'clock shadow". I am using my smaller shop vac,which has a smaller and more manageable hose and it is capturing virtually all of the sanding dust. If I encounter any thickness of bottom paint, I pull out the carbide scraper. So far, so good!
2 Weeks Ago 09:28 PM
xort Friend of mine is on year 5 with ABC3 in Norfolk. Last year never left the slip. Diver was amazed at how easy bottom cleaned; wipe off slime, no scraping.
I bought mine in 1 gallon cans for $130 each last summer.
I do not work for PPG or any connected company.
2 Weeks Ago 01:32 PM
casey1999
Re: Removing Bottom Paint

Quote:
Originally Posted by gah964 View Post
if thats true i would like to see this in person.never heard of the stuff.
if i could get away with wiping in 2 years im down with that.
Many peeps have never herd of Ameron abc 3. Mainly used commercially. I was turned onto it by a commercial boat painter 5 years ago and it does seem to work. Maybe the fact as one of the post said that it is harder than typical ablative paints makes it last longer if you do wipe it down. I do use a carpet and would dive the boat and wipe it down about every 6 months over the 5 years the original paint was on there.

Probably if I sailed the boat more often- like a typical cruiser might, that may not be necessary. And this paint is used on commercial freight ships that go 20 knots almost all the time- so they clean themselves.

Which got me thinking, ablative paints really need to be designed for the boat speed they will be operating. Seeing Amernon abc 3 is made for a ship going 20 knots all the time, it would need to be harder than a typical sailboat ablative seeing the sailboat goes 8 knots only occasionally.
2 Weeks Ago 01:23 PM
gah964
Re: Removing Bottom Paint

Quote:
Originally Posted by casey1999 View Post
From:
What type of bottom paint and why?

"I used Ameron ABC #3 ablative paint on Kismet 2 years ago here in Florida. I put 3 coats on and it is pretty thin now. We'll lightly sand and recoat with the same stuff this fall before we launch for our annual trek south.

We grow barnacles like crazy here in our warm water but the most we ever got with the Ameron was some slime that wiped off easily. I probably only wiped the bottom down thoroughly half a dozen times in 2 years.

We used to use Trinidad 75 SR before but it's a hard epoxy type and just builds up over time. Ablative types are better in that regard.

The drawback to the Ameron is that it comes only in 5 gallon pails and you can only get through a distributor. It's intended for application on commercial shipping. We bought ours from an outfit in Jacksonville. It was about $85 a gallon back then. No thinning required, apply straight from the can by roller. Comes out nice and smooth."
if thats true i would like to see this in person.never heard of the stuff.
if i could get away with wiping in 2 years im down with that.
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