my osmosis update

[tyce]

thanks for all the advice on my osmosis issue,
i had the surveyor at the boat this morning and he has had a prod around and has diagnosed wicking in the very early stages.
so the plan is to sand the gel coat heavily which will prob expose a lot of the blisters and leave till spring to dry, (bearing in mind most blisters have no moisture behind them now and it has only been out 2 months)
then have a good poke about with a moisture meter and check it is below a figure of 10, then v.c. tar it.
sounds like a good plan to me.
anyone have any opinions.
and anyone have an opinion on which epoxy is best. p.m. me if you dont want to mention brands.

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[marina95]

I've used VC Tar before as a preventative measure. Great stuff and easy to work with.

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[machurley22]

Excuse my ignorance. What is V.C. Tar please?

Dave

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[Talbot]

its an international product that is black and like tar, but is an epoxy type stuff. when you put it on it tends to smooth over rough surfaces leaving a nice smooth waterproof coat. each coat anneals into the previous (provided you observe the max/min times) and the first coat of antifoul (if its international) does the same.

Provides a waterproof coating that has some give to it so has better resistance to knocks than gelshield. Much better than gelshield for boats that dryout, and a lot easier to apply.

Did mine 11 years ago.

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[boatmike]

And it's a bit more tolerant to any remaining moisture. In a way it's a middle ground between re-gel coating the ground out areas and drying out completely and using hard epoxy. Not a bad plan it would seem in a case like this where the affected areas are small and treating the whole boat would be over the top.

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[Keith]

it would be a good idea to put a dehumidifier in the boat over the winter, stand it on the galley work top and direct plumb it into the sink stand all cushions bedding on end or take it home same with books and charts take those home as well, dry your bilges thoroughly and consider epoxying your bilge when you do the bottom, as fresh water in the bilge HAS the potential to find its way into the glass from the inside of a boat............VC tarred mine and though expensive, very happy with the results.......keith

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[macd]

It's actually called "VC Tar2" these days. No idea what #1 might have been, but as other posters write it's a 2-pack epoxy, and "tar-free", according to the tin. As well as being a moisture barrier, it's an effective antifoul primer. It also works as an anti-corrosive barrier on steel and aluminium. One of its best qualities is that it can be applied down to 5 degrees C, which gives many more windows of opportunity than most other epoxy products.

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[sonarbell]

Try This..

http://www.dacrylate.co.uk/select.htm

Epidac 2PE

Epoxy-pitch coating

100 microns

Outstanding water and chemical resistant coating.


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[Birdseye]

Interesting that VC tar is tar free! It used to be the case that epoxy tar as produced by the old coal board was the most water resistant of the epoxies and reasonably priced. The the paint companies spotted an opportunity...............

Twin pack poly is more waterproof, but what you need is film thickness which is much easier to obtain with epoxies.

Lots of coats!

<hr width=100% size=1>this post is a personal opinion, and you should not base your actions on it.