We used MIL-P-23337 High Solids Poly Imide Epoxy Primer in the Missile business.  We used it not only as a paint but as  a faying surface sealer and as a locking compound.  Great stuff.  We would mix up a batch into small specimen cups and freeze them.  Pull them out when we need to use them.  It would be a good barrier coat material but I would expect cost to be an issue.

Neil Schiller
1983 C&C 35-3, #028, "Grace"
Whitehall, Michigan

On 3/18/2021 7:11 PM, Josh Muckley via CnC-List wrote:
I had my bottom stripped this past summer.  The guy used what can only be described as a hand held planer to strip the gel-coat and layers of fiberglass.  He relaid 2 layers of fiberglass and then barrier coated it with a MIL-spec product.  MIL-DTL-24441 Ultra High Solids (UHS) by Sherwin Williams

https://industrial.sherwin-williams.com/na/us/en/protective-marine/catalog/product/mil-dtl-24441-type-iv.9528308.html

I found a little bit of research from the US Navy about it.
https://drive.google.com/file/d/1Nvoi-ISVw-EBBAdXvqyUkA1ABqBhvKOe/view?usp=drivesdk

The guy that did the job claims he's one of the only people who still do this type of work in the Chesapeake Bay area.  He raves about the quality of the MIL-spec stuff. Said it is a 2 part epoxy (the same as interprotect 2000 but way harder and better). 🤷‍♂️

https://drive.google.com/folderview?id=1HO_WioKQN365bHuBj0Cp-8bNTvU3KVza

Josh Muckley
S/V Sea Hawk
1989 C&C 37+
Solomons, MD

On Wed, Mar 17, 2021, 09:28 John McCrea via CnC-List <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>> wrote:

    All,

    Has anyone applied a barrier coat lately and can provide some
    advice on the number of coats to achieve the required thickness? I
    will be applying with a roller and trying to estimate the number
    of gallons to pick up at the Defender sale. Talisman will be
    getting sandblasted next week and want to fair and then barrier
    coat. Thanks!

    John McCrea

    Talisman

    1979 36-1

    Mystic, CT

    Thanks to all of the subscribers that contributed to the list to
    help with the costs involved.  If you want to show your support to
    the list - use PayPal to send contribution --
    https://www.paypal.me/stumurray Thanks - Stu


Thanks to all of the subscribers that contributed to the list to help with the 
costs involved.  If you want to show your support to the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

Thanks to all of the subscribers that contributed to the list to help with the 
costs involved.  If you want to show your support to the list - use PayPal to 
send contribution --   https://www.paypal.me/stumurray  Thanks - Stu

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