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Old 05 April 2014, 09:28   #11
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yes I got her permission to say that I did ask
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Old 05 April 2014, 09:30   #12
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There's a difference between methyl ethyl ketone and methyl ethyl ketone peroxide. You used the wrong one. Now, I'm not a chemist, but maybe straight MEK did cause a reaction. But, to be sure, you'd probably want to scrape and use the correct catalyst - methyl ethyl ketone PEROXIDE.
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Old 05 April 2014, 10:28   #13
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Ncp has hit the nail on the head there.

And your mixing ratio is correct, 1% is fine! Average recommends 2%, if you use too much catalyst you will cause the resin/gel to exotherme which will lead to other issues such as weakness or de lamination.

If you are mixing up a large quantity use 1% and put I a container that is shallow , this will reduce the overall temp in the pot and stop it from heating itself up too quickly.

I laminated 3 large mouldings last week in my unheated work shop all resin was mixed at 1% and it's all gone off fine.
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Old 05 April 2014, 10:31   #14
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I used the cataylist that was provided however i believe that temps were too low. I think I will have to scrape off and go again or is there another way can i flow coat over flow coat?
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Old 05 April 2014, 10:35   #15
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I once applied the flowcoat too thin and it never went off, I believe it was so thin that the wax never sealed the surface hence it staying tacky.


I mixed up another batch the next day and applied it on top of the tacky layer, it all went off with no problems.

Maybe try a test patch?
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Old 05 April 2014, 10:40   #16
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Old 05 April 2014, 10:40   #17
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alan

I note that where the flow coat is thick, it set fine the problem is were it was applied thin/ light

tsm
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Old 05 April 2014, 10:44   #18
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Quote:
Originally Posted by two stroke mick View Post
alan

I note that where the flow coat is thick, it set fine the problem is were it was applied thin/ light

tsm
Personally, Id lightly wipe down acetone/cellulose then recoat with flowcoat and the correct catalyst.
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Old 05 April 2014, 10:45   #19
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alan

I take that to mean scape off the flow coat grind back down and go again.
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Old 05 April 2014, 12:34   #20
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Sounds like not enough wax additive in the Gell
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