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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 Days Ago 02:32 AM
fallard
Re: Removing Bottom Paint

Here in CT, as in many other areas, you are required to contain sanding dust, usually by vacuum attachment to an electric sander/scraper. The blasters tent the boat and have a drop cloth to catch the fallout.

If you use a good hand scraper, chances are that you will remove the bottom paint by fracturing it--not shaving it. In any case, there will not be a lot of dust, but there will be a lot of heavy, dead bottom paint that you need to contain as it falls off. The last time I did this, I used discarded shrink wrap and disposed of the debris in stages. The paint debris can get quite heavy after 18 years, which was the age of both boats that I stripped using a hand scraper.

Once you have removed the paint, you will need to sand the bottom to prep it for the barrier coat (Interlux Interprotect 2000 or Pettit Protect.) Then you ought to use a vacuum attachment on a suitable electric sander.

If you follow the instructions for the barrier coat and subsequent bottom paint, you will be quite happy with the reduced maintenance for a number of years. I got 5 years on 3 coats of ablative bottom paint after stripping the first boat. All it needed was the pressure wash after the annual haulout. I only recoated after 5 years because I needed reassurance that the barnacles wouldn't came back.
2 Days Ago 02:11 AM
casey1999
Re: Removing Bottom Paint

Quote:
Originally Posted by fallard View Post
Agree with post #11. Try the carbide scraper indicated. Sandvik is another brand. I've used both and have removed the bottom paint from 2 boats over the years. You pull the scraper--not push. With the carbide scrapers, you can do the whole bottom without changing blades and you never have to sharpen it.

That said, The bottom blasters are coming this week to remove the 18 years of accumulated bottom paint. I plan to do the follow-on clean up with a sander and then do the barrier coat and bottom paint while staying within the recommended recoat times to avoid sanding between coats.

After many years, I finally read the instructions before diving into labor-intensive projects. Suggest you do the same and avoid extra work.
I was thinking of soda blast a few years back, but here in Hawaii I could not find anyone that did itAnd I am on the hard in a harbor, containment of the used soda and paint could be a problem.
2 Days Ago 09:05 PM
fallard
Re: Removing Bottom Paint

Agree with post #11. Try the carbide scraper indicated. Sandvik is another brand. I've used both and have removed the bottom paint from 2 boats over the years. You pull the scraper--not push. With the carbide scrapers, you can do the whole bottom without changing blades and you never have to sharpen it.

That said, The bottom blasters are coming this week to remove the 18 years of accumulated bottom paint. I plan to do the follow-on clean up with a sander and then do the barrier coat and bottom paint while staying within the recommended recoat times to avoid sanding between coats.

After many years, I finally read the instructions before diving into labor-intensive projects. Suggest you do the same and avoid extra work.
2 Days Ago 05:28 PM
deniseO30
Re: Removing Bottom Paint

Simple red devil type pull scrapers work well.. BUT! only if you know how to sharpen the blade every few minutes of hard scraping on fiberglass/gelcoat.
keep a file handy. drag it about 45* to sharpen then reverse and pull the file with the blade. it should create a "burr"

If the user does not keep the blade sharp they will quickly reach for the sander and make clouds of noxious dust
2 Days Ago 05:26 PM
aa3jy
Re: Removing Bottom Paint

Soda blast, fair then apply interlux 2000 barrier coat
2 Days Ago 05:17 PM
casey1999
Re: Removing Bottom Paint

Quote:
Originally Posted by RichH View Post
FWIW - Ive found the use of a FEIN Multi-tool with a chisel blade (honed with a 6000-8000 grit on a Japanese 'water-stone' makes quick work of 'cratered'/lifted (adhesion loss) bottom paint. Then, the 'happy fairing' can begin.
Thanks, This boat must have 10 coats of bottom paint on her. 5 years ago I sanded for about 2 days (8hrs a day) and only was able to get the loose off. When we pulled her out, the bottom paint held up very well. Even after a pressure wash the paint (Ameron ABC #3) adhered still. Only at the bottom of the lead keel and some areas of the lead keel had the paint come off- probably the lead not prepped well.

I am thinking maybe it is time to strip away some of those layers.
2 Days Ago 05:09 PM
RichH
Re: Removing Bottom Paint

FWIW - Ive found the use of a FEIN Multi-tool with a chisel blade (honed with a 6000-8000 grit on a Japanese 'water-stone' makes quick work of 'cratered'/lifted (adhesion loss) bottom paint. Then, the 'happy fairing' can begin.
2 Days Ago 04:11 PM
casey1999
Re: Removing Bottom Paint

Well I finally, after two years pulled the boat out and getting ready to repaint bottom, along with a lot of other work.

I plan to buy the drag scrapper as suggested by Tommay in post #11. Do you use this scraper by pushing into paint or pulling?

Also, after I scrape, I think I will need to sand. Can you recommend a sander from this Home Depot web site:

¬*The Home Depot matchall&NCNI-5

5 years ago the boat yard let me borrow there big rotary sander and it worked good, but at a different location now.
Thanks
04-22-2013 07:15 PM
casey1999
Re: Removing Bottom Paint

I put this on 3 years ago (3 coats):

http://ppgamercoatus.ppgpmc.com/mark...WhitePaper.pdf

Very satisfied. Now I am getting hard growth only on the bottom of my lead keel. Not really sure why, but all the paint has come off just on the very bottom of the keel, which then allows hard growth. Need to use metal scraper to remove. I would imagine with monthly cleanings, I could get 2 more years (but plan to haul out withing 6 mos to do some drive line work). Next time I plan to put 5 coats of this on and prep and prime the underside of the lead keel better.
04-22-2013 07:08 PM
Ferretchaser
Re: Removing Bottom Paint

I have one thing to add to this thread. Don't buy cheap anti fouling systems. It just does not pay in the long run. Don't ask me how I know this but many moons ago it turned out to be a heck of a lot of work with the cheap stuff.

ATB

Michael
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