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Old 01-27-2023, 10:02 AM   #1
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Raw Water Gasket Sealants?

Has anyone found a sealant or something that will seal raw water-side gaskets? My DD 4-71Ns had the heat exchangers cleaned and the gaskets replaced 2 yrs ago, but within 18 months or so I could see salt blooms beginning to seep out at the top and sides of all the gaskets. On certain gaskets the mech who was showing me how to do it used a red substance on them that stayed sticky for months, and on some he used red RTV, but they all eventually seeped. Any success stories out there?
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Old 01-28-2023, 04:14 PM   #2
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rtv red works great. The trick is install the gasket with the rtf. Tighten not to spec. . let sit 24 hrs. and tighten to spec.
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Old 01-28-2023, 04:16 PM   #3
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This will fill any compromises in the mating surfaces.
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Old 01-28-2023, 04:27 PM   #4
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Greetings,
Mr. J. ANY RTV product has NO place on a boat IMO! Since it already has been applied I fear anything short of more RTV (which will fail AGAIN) is going to fail unless you can completely remove all traces of said RTV. VERY difficult to remove to the point where a proper sealant will do it's job.
I suspect the red "substance" the mechanic used hay have been something like this:

https://www.permatex.com/products/ga...-sealant-4-oz/.

I've called Permatex technical support in the past and they've been helpful.

https://www.permatex.com/contact

I'm sure they're quite familiar with DD's.
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Old 01-28-2023, 04:29 PM   #5
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ok everyone has their opinions I guess?
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Old 01-28-2023, 05:36 PM   #6
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On certain gaskets the mech who was showing me how to do it used a red substance on them that stayed sticky for months, and on some he used red RTV, but they all eventually seeped. Any success stories out there?
The red, sticky stuff was probably Permatex High Tack gasket sealant. I've had good luck with it on water pumps.
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Old 01-28-2023, 07:20 PM   #7
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Aren't they the same thing, essentially?
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Old 01-29-2023, 11:02 AM   #8
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Aren't they the same thing, essentially?
Permatex uses the terms "gasket sealers" and "gasket makers". The former is used to enhance a gasket seal, the latter can be used to replace a gasket.
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Old 01-29-2023, 11:28 AM   #9
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Next year I am going to try cutting a new cork gasket, a thick one, maybe 1/8 inch. Clean the surfaces and try it dry. I'm sick of scraping old gasket goop off the surfaces. There is really minimal pressure there.

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Old 01-29-2023, 11:48 AM   #10
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Next year I am going to try cutting a new cork gasket, a thick one, maybe 1/8 inch.
If you don't already have a set, be sure to pick up a set of gasket hole punches. Makes a world of difference.
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Old 01-30-2023, 08:04 AM   #11
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I have good luck with this sealant: https://www.napaonline.com/en/p/PTX7...&gclsrc=aw.ds&
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Old 01-30-2023, 08:23 AM   #12
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I had the same problem with my 3208 gear cooler. Tried everything over the years and eventually leaked. Was sealing portholes with Butyl tape and thought - nothing to lose. Left the gasket out and just used the tape. Hasn't leaked in 2 years.
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Old 01-30-2023, 09:26 AM   #13
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Greetings,
Mr. h. I used to keep these on board. For larger holes I would just nibble around the edges.





About $15 or so...
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Old 01-30-2023, 10:26 AM   #14
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I have good luck with this sealant: https://www.napaonline.com/en/p/PTX7...&gclsrc=aw.ds&
How do you remove that?
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Old 01-30-2023, 10:36 AM   #15
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How do you remove that?
I use a gasket scraper and solvent. To be clear, I use it on seals or gaskets I will be replacing.
If youre sealing rubber gaskets that you intend to reuse, Id go with the earlier suggestion of a good rtv. I like ultra black rtv, and follow the advice to assemble it, but not torque it till the next day.
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Old 02-03-2023, 04:44 PM   #16
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sealant

I agree with Bmarler, I was an auto mechanic for 40 years and have always done all my boat repairs. I have used Permatex Aviation Form-a-gasket for many years with good results. I found ATV was good for lighter duty jobs such as valve covers,ect.
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Old 02-03-2023, 05:24 PM   #17
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My favorite gasket maker/sealer was from Toyota called " FIPG" formed in place gasket , others have similar it is a type of anaerobic sealer
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Old 02-03-2023, 07:28 PM   #18
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Thanks for all the input and recommendations. I went with Loctite 518 gasket maker/gasket sealer (their words). I'll let you know in 18 months how it turned out....
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Old 02-03-2023, 09:19 PM   #19
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we use some 3mm thick bio fuel resistant rubber. which we cut on size. a sheet is cheap and use if for any kind of heavy gasket
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Old 02-03-2023, 09:58 PM   #20
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Loctite 515 is what I use and have always been happy with. Just smear it on both sides of the gasket.
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