Barrier coating

Saltydoc58

Commander
Joined
Oct 8, 2020
Posts
284
Likes
210
Location
Lloyd Neck, NY
First Name
Robert
Boat Make
Ellis 28 Yanmar 6LPA STP 315HP, Parker 1801 Yamaha F115
So…. long story short…. After having boat yard scrape all the bottom paint off in March… foreman and workers quit before finishing the job.
So this 63yo surgeon with bad shoulders has been on his back sanding and plans to barrier and bottom paint myself next weekend to salvage June.
Hull( 1998) in excellent shape -not a single blister or bleb…. Superb Maine craftsmanship. Gel coat is blue tinted. Sanding and prep almost complete.

Which barrier coat product to use - Petit, Total Boat,Seahawk, etc


F175E5AF-4CC7-44D5-8DCE-04280C0DB0C0.jpeg FD94881E-53DD-4DAE-A96D-70695BEE3F03.jpeg ED4F3842-D4DA-48C2-9D1B-1F4E1AB13E26.jpeg
 

Genius

Admiral
Joined
Feb 11, 2016
Posts
6,936
Likes
5,790
Location
Rhode Island
First Name
David
Boat Make
32 Morse Cove
I usually stick with the same brand of paint I am using for the bottom paint. The silver epoxy from Interlux. HS?
 
  • Like
Reactions: DAS

goin4broke

Rear Admiral
Joined
Aug 28, 2015
Posts
1,328
Likes
702
Location
Mystic,CT
Boat Make
35 Foot Terry Jason (Currently undergoing finishing touches)
Second on Interlux HS. Less coats and time intervals. Be sure your down to gelcoat and wash a couple times with soap/water then the Interlux 202 wash.
 

Saltydoc58

Commander
Joined
Oct 8, 2020
Posts
284
Likes
210
Location
Lloyd Neck, NY
First Name
Robert
Boat Make
Ellis 28 Yanmar 6LPA STP 315HP, Parker 1801 Yamaha F115
Probably will lean toward compressed air blowing and solvent wipe downs to avoid wetting hull now that it has dried out for 5 months.

Interlux recommends MONTHS of dry time after their wash or “ forced drying”

 

Genius

Admiral
Joined
Feb 11, 2016
Posts
6,936
Likes
5,790
Location
Rhode Island
First Name
David
Boat Make
32 Morse Cove
Probably will lean toward compressed air blowing and solvent wipe downs to avoid wetting hull now that it has dried out for 5 months.

Interlux recommends MONTHS of dry time after their wash or “ forced drying”

I don’t believe that.

You just need to sand, vacuum, mechanically wipe with solvent and or broom.
 

goin4broke

Rear Admiral
Joined
Aug 28, 2015
Posts
1,328
Likes
702
Location
Mystic,CT
Boat Make
35 Foot Terry Jason (Currently undergoing finishing touches)
Probably will lean toward compressed air blowing and solvent wipe downs to avoid wetting hull now that it has dried out for 5 months.

Interlux recommends MONTHS of dry time after their wash or “ forced drying”

Spraying the surface is much different than the osmosis issue from months of immersion. Especially if the gelcoat is in tact and no blister issues as you have indicated. However, as long as your solvent rag is coming off the hull clean you should be good to go.

The wash just helps get more residue off prior to using expensive chemicals. I’m not keen on a compressed air “blow job” and your marina may have a say in that.
A vacuum with a brush head would be better.
 

Saltydoc58

Commander
Joined
Oct 8, 2020
Posts
284
Likes
210
Location
Lloyd Neck, NY
First Name
Robert
Boat Make
Ellis 28 Yanmar 6LPA STP 315HP, Parker 1801 Yamaha F115
Understood- thanks for input. Plan to finish up prep this week after work, buy paints and supplies- and hit it this weekend.
 

ThePartsGuy

Commander
Joined
Feb 11, 2018
Posts
431
Likes
458
Location
NEWBURYPORT MA
Website
www.merri-maryachtbasin.com
First Name
BILLY
We use the Seahawk's Tuff Stuff for barrier coat in our yard exclusively. Perfect hot coat times and high build for mil thickness in as few as 2 coats. Whichever brand you choose following the Standard Operating Procedures the manufacture has laid out will be the key. They 100% do NOT want you to fail for their brand protection if nothing else.

Good luck!
 

BillD

Admiral
Joined
Sep 1, 2011
Posts
8,138
Likes
3,890
Location
Portsmouth NH.. Piscataqua and Merrimack Rivers
Boat Make
27 H&H with Cummins QSB 5.9 480 power
We use the Seahawk's Tuff Stuff for barrier coat in our yard exclusively. Perfect hot coat times and high build for mil thickness in as few as 2 coats. Whichever brand you choose following the Standard Operating Procedures the manufacture has laid out will be the key. They 100% do NOT want you to fail for their brand protection if nothing else.

Good luck!
Agreeing with Bill The Parts Guy.........
I've used SeaHawk barrier coat (it's a gray color) on two hulls now. Two part easy mix, high build, two coats same day...followed up by three coats of Seahawk AF33. Excellent working times.

IMG_5050 (1).jpeg
 

osprey47

Commander
Joined
Oct 5, 2012
Posts
259
Likes
63
Location
Annapolis, MD
First Name
Joe
Boat Make
BHM 36 w/ Yanmar 6LYA-STE
Good experience with the Pettit barrier coat. Did a 47' sailboat: three coats alternating grey and white. That said, I do like the results of Interlux products.

Sanding your bottom paint. This is a young person's task. I have had two boats powder blasted with excellent results. One the 47 footer, the second, my BHM-36 and the barrier coat put down many years ago was in excellent condition.
 

Ronin120

Ensign
Joined
Aug 13, 2020
Posts
5
Likes
12
Location
Reedville, VA
Boat Make
Mast & Mallet Thomas Point 34
Well, I can suggest what NOT to do. A cautionary tale.

For reasons that I have conveniently forgotten I ended up with a full 3 gallon kit of Interlux Interprotec 2000E and 4 gallons of Sea Hawk Monterey water-based antifouling sitting in my shed.

The bottom, original from 1998 and falling off in chunks, had been "sand-blasted" in February and left to dry out. They did not do a good job. Like the OP, I had to spend time sanding those areas before applying materials. And I'm 70. Damn near killed me...

Anyway, after RTFM, I realized that putting a water-based antifouling over the Interprotec was not optimum. I consulted with the yard owner. We figured that putting a black "guide" coat of Interlux Fiberglass Bottomkote NT per Interlux's direction, I should be somewhat safe with the following three coats of Red Sea Hawk Monterey.

Time will tell. I dive on my boat (former sailboat racer...) so I'll be able to see how it fairs this season. I'll report back.

IMG_4037.jpeg

66948940176__121024B4-BB18-4E6C-BE07-28CD449C40AB.jpeg

IMG_4048.jpeg

IMG_4060.jpeg

IMG_4067.jpeg
 

Fishnjess

Captain
Joined
Aug 18, 2017
Posts
869
Likes
565
Age
48
I used interprotect 2000e in ‘18 with 3 coats alternating gray white gray. Followed by 2 coats of Interlux Fiberglass Bottomkote NT, blue then black. She held up nice when coming out in the summer of 20.
But, I looked at a bottom done with sea hawk barrier coating and was impressed with the results.
 

Genius

Admiral
Joined
Feb 11, 2016
Posts
6,936
Likes
5,790
Location
Rhode Island
First Name
David
Boat Make
32 Morse Cove
...as always read the instructions with whatever you choose. It's been my experience that the tie coat between barrier coat (epoxy) and the first coating of bottom paint needs to be timed correctly to get the chemical bond. It isn't just a mechanical bond that gets the good adhesion. If not done correctly, I've seen it fail. That is kinda why I like to stay within a paint companies "system". see below for Intlerlux HS notation:

"Note: If maximum overcoating time with antifouling is exceeded, sand with 80220 grade (grit) paper (coarser grade is unsuitable for above water areas), or apply an additional coat of InterProtect HS"
 

mmac1913

Lieutenant
Joined
Feb 14, 2021
Posts
58
Likes
112
Location
Maryland
First Name
Mike
Boat Make
Jarvis Newman
So…. long story short…. After having boat yard scrape all the bottom paint off in March… foreman and workers quit before finishing the job.
So this 63yo surgeon with bad shoulders has been on his back sanding and plans to barrier and bottom paint myself next weekend to salvage June.
Hull( 1998) in excellent shape -not a single blister or bleb…. Superb Maine craftsmanship. Gel coat is blue tinted. Sanding and prep almost complete.

Which barrier coat product to use - Petit, Total Boat,Seahawk, etc


View attachment 134924 View attachment 134925 View attachment 134926
For what it's worth, I used Interlux 2000E, 4 Coates after blasting the old stuff off, I hired a great guy did and exultant job of blasting. Followed the barrier up with 3 Coates of Seahawk AF-33, we will see how it all plays out this fall when we haul.
 

Eye doc

Lieutenant
Joined
Jun 28, 2021
Posts
53
Likes
124
Location
Portsmouth, RI
First Name
Al
Boat Make
31’ JC
Recently purchasing a 38 yo 31’ JC, I had the task of redoing the bottom. When I hauled out, I saw that I had an ‘osmosis’ isuue. With the guidance of Shor 2832, I set out to rectify the problem. Getting a good grinder/extractor was key. Soda blast/ grind/ sand /wipe. One coat of Interprotect 2000, filling in holes with Interprotect Watertite, 4 more coats of Interprotect, 2 coats Micron CF

691E90D0-88A7-44F1-B614-9526F26AB087.jpeg AC92FDA8-6FFC-4254-9B0E-3C86FEAD4B83.jpeg FC40BDE0-20C3-4852-9ABD-ACB863C89F0E.jpeg 7A2A48E7-7DFB-41A6-B158-18F473EB497C.jpeg
 


Latest Posts

Top Bottom