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  #1  
Old 06-21-2008
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Im a complete IDIOT!

I dont believe it.

Just laid 3 coats of epoxy to the deck of my miracle sailing dinghy.
Its taking a while to cure so i recheck the label.

It says 2 parts epoxy for 1 part hardener.
Ive been mixing 3 to 1!!!!!!!!!!!!

Its been 4 days, not v warm ones, and the glassing ive done seems to have set hard. Its not tacky.

The decks when sanding have been a bit smeary, even after 3 days.

Been sanding a fair bit because it was sagging and bobbling.
Now i know why.

Am i trully stuffed or will it fully cure?

The deck needs to be waterproof but structurally wont be taking a load.
The reinforcing of the transom using epoxy, filler and tape seems to have hardened nicely but will it fall apart over the season?

Help!
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Old 06-21-2008
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Call the vendor; epoxy is epoxy is epoxy, but the hardeners are what are different from one to the next. I will tell you that I eyeball 2:1 for small stuff and I know I am off a bit sometimes and it has taken longer than it should, but I have never had to redo. But multiple coats of resin without enough hardener I am not as sure about. Call the vendor of the hardener.
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Old 06-21-2008
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I doubt it will cure properly, being mixed with only 75% of the hardener it needs. Epoxy needs to have the proper ratio of hardener to resin since it needs the chemical components of both to cure properly.
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Old 06-21-2008
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the cross strand matting i glassed to the floor seems pretty hard.
Only one coat there.
Also the filler i used to plug a hole sands back nicely.
Ive got my fingers crossed that the deck will be okay.
My worry now is can i glass over the top of my transom repair?
It doesnt shrink like polyester.
Ive keyed the surface thoroughly and wiped down with acetone.
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Old 06-21-2008
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Are you sure that you've been mixing all the epoxy at 3:!, not just the last batch or two. It does sound like you may have mixed some at 2:1.
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Old 06-21-2008
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Please correct me if I am wrong, but I have read that you should not use epoxy when using fiberglass Mat.
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Old 06-21-2008
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Its possible i started off right.
I was being pretty cautious.
Then I got a bit cocky, and must have read 3 to 1 in a forum somewhere.

The crossed strand matting looks solid and that was definitely 3 to 1.
Its the deck im worried about.
Its had at least 2 coats at 3 to 1.

Its been nearly a week and when i sand back it goes to paste. This isnt all over though, just in a couple of places where its sagged.
Id hoped it would have set by now but if i leave it another week or two im hoping itll be okay.

Its epoxy-resins.co.uk kit. Measuring ratio in black n white on the label, but im gonna have to go and fess up and get some advice. duh!
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Quote:
Originally Posted by Freesail99 View Post
Please correct me if I am wrong, but I have read that you should not use epoxy when using fiberglass Mat.
If im wrong on this just take me out and shoot me!

Im pretty sure epoxy and glass fibre go together like ham n eggs.

I was informed recently that polyester resin can be used as a cheaper alternative to epoxy BUT it contracts, does not grip the wood as well and (i think) ages.

See, im learning all the time
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Old 06-21-2008
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Quote:
If I'm wrong on this just take me out and shoot me!

I'm pretty sure epoxy and glass fibre go together like ham n eggs
Epoxy and fiberglass cloth yes they work wonderfully together. But Mat is a different animal I spent a month repairing a repair done with fiberglass Mat.
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isnt mat like chopped strand but woven with "cross strands"?
Id be suprised and interested to know cos ive used some tape in places with similar crossed strands.

But, as you can probably tell, im not exactly an expert
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