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Old 01-28-2019, 11:53 PM   #1
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Chemical bottom paint stripper

I am going to strip my bottom paint this March to remove years of bottom paint. Does anyone on here have experience doing it and what brand did you use. also do you need to barrier coat after chemical stripping.
Thanks
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Old 01-29-2019, 12:38 AM   #2
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Many years ago I did this to a previous boat. What a horrible experience. I used a stripper that you painted on very thick and then covered it with a paper so it would not evaporate as quickly. It didnít do a great job. It was way more work than I had thought. A different boat that I needed stripping I had soda blasted. What a difference. Yes, if you are stripping the hull, I would definitely do a barrier coat. Cheap insurance and easy to do after the hard work of stripping is done.
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Old 01-29-2019, 12:38 AM   #3
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You will probably be best served by having your hull soda blasted, rather than chemical stripping. Environmental issues with chemical strippers and the mess are going to be an issue pretty much anywhere you do it. Finding a yard that will deal with the whole stripping job is probably wise. It's probably less expensive than you think.

If you don't have a barrier coat, or don't know if you have a barrier coat, you should plan to barrier coat.

That's just my two cents, but I have never heard of anyone chemically stripping bottom paint before...
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Old 01-29-2019, 02:05 AM   #4
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I am unsure if I have a barrier coat at the moment. I was looking at pettit brand. It apparently only requires 3 coats instead of 6.
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Old 01-29-2019, 06:04 AM   #5
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I used a citris brand a friend wanted me to use on his 42 foot sailboat.


The first stripping was miserable putty knifing it off.


Then he remembers you could pressure wash it off. Much better but I am not sure I would want to do a hard chined powerboat.


The stripper itself was environmentally friendly but the resultant residue my not be. But shouldn't be much different than blasting, just the collection might be an issue.


I don't remember the name he had, I just used some Citris based stripper from Home Depot on a topside doorframe that worked well.
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Old 01-29-2019, 08:21 AM   #6
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Citrus stripper from Home Depot works well. I always have it around the house. Having said that, I cannot think of a worse job than using that on the bottom of a boat. The mess would make me crazy. It has to be over 60 or 70 degrees for the stripper to work well. You have to cover it with newspaper or plastic to keep it from evaporating. You will have it in your eyes, ears, and a**hole. If it’s about $$$$, find a way to make a few to pay for sandblasting. Trust me
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Old 01-29-2019, 09:22 AM   #7
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The only chemical stripper that I found that will go down to the base coats was peel away. You put it on thick, then cover with a paper to keep it from drying out and then let it sit overnight for about 12 hours. Then you lay down plastic and scoop it off one narrow 2-3 inch strip at a time. Bag up the goo, lay down fresh plastic and do the next strip. Repeat. It will take hours. Then apply the next section or side, come back the next day and you will essentially have it. There will still be a residue, so break out 5he vacuum sander and finish it off.

I tried most of the other chemical strippers like pintoff, aircraft, west, citrastrip and none of them would do anything but just make the top layer a little gooey before they dried out and stopped working. Ymmv, but they are all expensive and may not work much at all. Could not imagine doing anything with them but a small area. I tried to do a small trim tab and just wound up sanding.

Not my recommended method. Iíd just pay someone to vacuum sand the whole thing.
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Old 01-29-2019, 09:34 AM   #8
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I stripped the bottom paint off a previous boat, a 31' Island Packet. I used "Peel Away". Lay it on thick, cover with their special paper (or plastic sheeting) to seal from air, let it sit overnight, and start peeling it off with a joint compound knife. The bulk of the paint should come off with the first coat, but several coats may be required. It is messy. You need to lay down plastic tarps on the ground to catch the crap as you scrape it off. After striping, washing, and a light sanding, I applied a barrier coat. Probably the cheapest alternative for hull striping, over sanding, soda blasting, et al. Definitely a "do-it-yourself" option. I did one side one year, the other side the following year.
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Old 01-29-2019, 10:11 AM   #9
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When I had a boat soda blasted it cost $35 per foot.
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Old 01-29-2019, 10:34 AM   #10
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I sanded this summer. Laborious job. Brutal actually. Didn't have much choice as my boat yard no longer allows soda blasting. EPA has stringent rules about collecting residue and it's just wasn't worth the trouble for the yard.

Putting barrier coat on was very easy in comparison.
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Old 01-29-2019, 10:45 AM   #11
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Had both my boats sandblasted down to the gel coat. One had probably 30 coats of hard bottom paint. Left a nice scuffed surface for the barrier coat to stick to. I would look for a boatyard that still sandblasts.

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Old 01-29-2019, 10:53 AM   #12
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I'm back now, after reading the words "chemical stripper" I ran screaming from the room and across my front yard. If you got the money soda blasting is the way to go, just point them at the boat and come back later with a check, no gagging or coughing, no gooey mess to clean up, plus you'll live an extra year or so. In truth I do my own using a sharpened stiff putty knife and do 3 or 4 square feet at a time and in a few days it's done. Yes to barrier coat and I'd suggest ablative bottom paint to avoid this fun in the future.
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Old 01-29-2019, 10:54 AM   #13
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Quote:
Originally Posted by Comodave View Post
When I had a boat soda blasted it cost $35 per foot.
OUCH! $16.00 a foot here.
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Old 01-29-2019, 08:04 PM   #14
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Now I'm rethinking this.
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Old 01-29-2019, 08:23 PM   #15
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I think the by-the-foot price is also dictated by the beam of the boat. For my 30' boat I paid $100 a foot for blasting, barrier coat, and two coats of Trinidad SR bottom paint. It seemed very reasonable to me at the time, just the paint is $500 for two gallons...

My boat yard no longer allows bottom sanding in the yard, they are concerned about the contamination to the ground and other boats nearby.
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Old 01-29-2019, 08:36 PM   #16
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I used chemical striper on the botom of a 37' trawler in 2011. Took me and my brother two days. I used the same stuff I use in my flooring business a Zip Strip product. It worked fast in about 50* weather. The key in my case was a generous coat giving it about 20 minutes before scraping with a sharp scraper or putty knife. The stripper could be neutralized with water so I hosed each section as I went to avoid softening the gelcoat.

You can actually do more work faster with a 1-1.5" tool as long as you keep it sharp. I did have to sand after to get some spots and a smooth finish but was able to move the sander like an eraser on a chalkboard. Used a dust hood and vacuum on the sander. Also had plastic under the boat to catch debris.

Then did 6 coats of barrier. The Interlux rep. recomended I alternate white (I think) and gray barrier coat to make it easy to see any missed spots. A flag coat of black ablative bottom paint then 2 or 3 coats of red ablative.

The hardest part was sanding, it's hard to hold the sander over your head. We did make some low staging so we could lie on our backs, elbows on chest to make it easier. Also wore Tyvec suits and full face respirators.

Good Luck!

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Old 01-29-2019, 10:23 PM   #17
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The hardest part was sanding, it's hard to hold the sander over your head. We did make some low staging so we could lie on our backs, elbows on chest to make it easier. Also wore Tyvec suits and full face respirators. Rob
We did a hard dry machine sand of our 36ft boat,using only surgical masks for protection,following some hull work. I envy your protection.
Very little a/f build up, the PO had it soda stripped not long before but didn`t do the hull work. A truly disgusting filthy job working overhead lying on your back,took 2 of us a day per side. We got a lovely smooth hull belying the age of the boat. But never ever again would I do that.
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Old 01-29-2019, 10:44 PM   #18
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You should talk to Keith at Blackline in Sidney, seems they have a new way of stripping old bottom paint off, a few members at our club had them do it and were very please.Dont know what the cost was but Keith will let you know, hope this helps.........
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Old 01-30-2019, 07:12 PM   #19
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You should talk to Keith at Blackline in Sidney, seems they have a new way of stripping old bottom paint off, a few members at our club had them do it and were very please.Dont know what the cost was but Keith will let you know, hope this helps.........
Thanks I will do that. I am hauling at canoe cove, so black line is in the yard.
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Old 01-30-2019, 07:43 PM   #20
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But never ever again would I do that.
I'm with you Bruce!

Rob
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