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Forum LockedSurface prep for Interprotect

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chris11211 View Drop Down
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    Posted: 24 Apr 2014 at 11:21am
I'm scraping/sanding/using 229 remover as I attempt to clean off 7 layers of antifouling and primer from a 32ft fiberglass sloop (1970's vintage) I am now exposing the underlying gelcoat which seems free of blisters.

Despite my best efforts, there are still some spots of primer haze remaining on/in the gelcoat. Without significant thinning of the gelcoat, I believe it will remain.

As I plan on using 5 layers of Interprotect before I antifoul, is there any way to verify that the barrier coat is compatible with the exposed surface?

Many thanks
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Ken@Interlux View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken@Interlux Quote  Post ReplyReply Direct Link To This Post Posted: 25 Apr 2014 at 3:14pm
Chris,
 
In order to test for compatibility, you will need to get some Interlux 2316N reducer.  Soak a rag in the 2316N and place it on the primer.  Cover it with a taped down plastic bag, and let it work for about an hour.  If the thinner wrinkles, blisters or melts the primer, it will have to be removed prior to applciation of Interprotect 2000E.
 
-Ken
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Jeffmg View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jeffmg Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jul 2016 at 7:27am
I've had my boat soda blasted down to a barrier coat that a former owner applied, he believes they used interprotect but is not 100% sure

I found some damage and a couple of small blisters that needs to be repaired and will reapply interprotect over the repairs

will this compatibility test also work with the barrier coat currently on the boat? Should I do another full coat of interprotect over the previously soda blasted bottom for uniformity?

Thanks,

Jeff
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BoatNut View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BoatNut Quote  Post ReplyReply Direct Link To This Post Posted: 09 Jul 2016 at 8:49am
That test would assure that the primer still remaining on the boat was some form (or brand) of epoxy coating which it likely is since the soda blast would have easily removed a conventional primer.  If the epoxy on the hull is still thick enough to function as a moisture barrier there is no mandatory reason to do an overall final coat of interprotect except for the fact that you will get a much more uniform adhesion of your bottom paint if you do an overall coat and the anti-foul will dry more evenly and have a better appearance than if you are covering a patchwork of old and new primer coatings.
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