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Old 11-25-2020, 08:43 PM   #1
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Barrier coat education wanted

Today I had a company start blasting the bottom of my boat. So far it looks great my question is what barrier coat do you guys prefer to use and how many coats do you recommend? I am going to apply it myself and want it done right. Thanks
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Old 11-25-2020, 09:30 PM   #2
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Interlux Interprotect. I have used it on multiple boats. I call Interlux and ask them how many gallons the boat needs and then go 1 more gallon just in case. It is really easy to put on multiple coats, all the hard work comes before you start to paint. And you are having it done now with the blasting. You put the first coat on and then when it is thumbprint dry, push your thumb on the paint and it doesnít come off on you but does leave a thumbprint, then you recoat. Donít let it dry completely or you have to sand and clean the hull. If you recoat at the proper time it is easy. The last boat we painted we did 6 coats of barrier paint and 2 1/2 coats of bottom paint. Some days we only put on 1 coat and some days we did 2 coats depending on thumbprint dry. It was a 32í with a 13í beam and a coat took about 45 minutes to lay on. We had the yard bring the boat to our house and block it on the driveway so we were on concrete and could use a creeper.
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Old 11-25-2020, 09:45 PM   #3
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Agree w Dave
I've used it and was able to do one coat AM another PM and you need to observe same for first coat of bottom paint. I think I did 3 coats barrier (min recommended if memory is correct) plus 2-3 bottom paint. I thin my bottom paint more than mfg recommends and add another coat based on my yard recommendation.
Make sure you have enough good Wx days to get it done or it gets to be a lot of extra work & $.
Look for the instruction sheet online, print and read it over and have a plan. It lists approx dry time based on temp & humidity.

There's more work involved if you want /plan to move jacks & paint those areas also.
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Old 11-25-2020, 10:19 PM   #4
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We did the whole bottom except for the blocking. Then the yard came to the house and moved the blocking and we went through the process again but the time it took to do the spots was like 5 minutes per coat.
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Old 11-26-2020, 06:51 AM   #5
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I agree with what already has been mentioned. In addition, alternate colors with each coat to make sure you're getting complete coverage. More thinner coats is better for uniform overall thickness. As it's unlikely you will ever do this boat again, a little more thickness has a very small cost in the overall job cost.

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Old 11-26-2020, 07:08 AM   #6
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With the Interlux all coats do not have to go at the same time anymore so you don’t have to kill yourself. I did 2 coats per weekend. Interprotect 2000e is now 6 months max between coats with no sanding. Instructions below. As stated above an extra coat can’t hurt.

https://www.wholesalemarine.com/inte...kit-79094.html
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Old 11-26-2020, 08:27 AM   #7
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Quote:
Originally Posted by Cigatoo View Post
With the Interlux all coats do not have to go at the same time anymore so you donít have to kill yourself. I did 2 coats per weekend. Interprotect 2000e is now 6 months max between coats with no sanding. Instructions below. As stated above an extra coat canít hurt.

https://www.wholesalemarine.com/inte...kit-79094.html
That is nice news. I have not done a barrier coat since 2014. That was 3 boats ago so I havenít read the directions lately. I would still do it all at once just to get it over with.
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Old 11-26-2020, 10:19 AM   #8
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There are a lot of barrier coat products out there. Each one is a little different as to application technique. And each is a little different as to the number of coats required.

Do some research on each one and find the best one that works for your application.

See https://support.jamestowndistributor...at-on-my-boat-
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Old 11-26-2020, 04:18 PM   #9
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Quote:
Originally Posted by Cigatoo View Post
With the Interlux all coats do not have to go at the same time anymore so you donít have to kill yourself. I did 2 coats per weekend. Interprotect 2000e is now 6 months max between coats with no sanding. Instructions below. As stated above an extra coat canít hurt.

https://www.wholesalemarine.com/inte...kit-79094.html
That's good news. Its been many yrs since I did mine and did not hear about the change.
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Old 11-26-2020, 04:23 PM   #10
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If you have the yard leave an extra few jacks you can just place the extra jacks on the painted area and unscrew the jacks where you need to paint after cranking the extras tight, the only places that doesn't work is where the blocks are under the keel. This is the system I use in the yard when doing bottom paint.
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Old 11-26-2020, 06:41 PM   #11
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Over the years, the yards I have been hauled in would have a heart attack if anyone but their staff moved a jack stand. Get the yard staff to adjust the jacks as needed. I would coat under the stands as well.
If it were my boat, I would use Interprotect (as many others have stated) and since you are having the bottom 'blasted" to bare, I would apply 5 coats. This will offer great protection. Two coats of antifouling, and maybe 3 along the waterline, and any other high wear areas (depending on what paint you are using).
Good luck.
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Old 11-26-2020, 06:59 PM   #12
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Moving the jack stands without moving the keel blocking doesn’t do any good, you have to paint both areas.
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Old 11-26-2020, 07:25 PM   #13
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Difference between yards, and the job. With just bottom paint, you can get the keel done while it's on the trailer overnight before launching. Not so with barrier coating. My yard is comfortable with my competence level setting the jack stands, but it is also a smaller yard and I know the owner quite well.
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Old 11-26-2020, 08:32 PM   #14
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The boat is at my house. I had to pay for oversize load permit but it is so easy to get stuff done. I have it in a 16 x 40 shelter that I can heat so I have no excuses. I plan to move the stands I know the guy blasting has moved them. The blocks are an issue not sure what I will do about that.
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