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Weird film on top of epoxy

Posted by Sandy 
Weird film on top of epoxy
January 18, 2001 09:12PM
I hope you aren't getting really annoyed with all of my questions.

However, last night I was mixing up some epoxy for some glue for my stem and the epoxy did something really funky. If I let it sit for even a few minutes a film formed across the top. If I stirred it, the film woould mix in without any problems. I have built three canoes and have done a decent amount of work with epoxy and have never seen this. Does anyone know what was happening? I used the epoxy anyway, and it doesen't appear that there are any problems.

Danny
Re: Weird film on top of epoxy
January 19, 2001 03:18PM
In reply to "Weird film on top of epoxy", posted by Danny on Jan 18, 2001:
>I hope you aren't getting really annoyed with all of my
> questions.

No, no way. Every question that gets asked here
becomes a resource for other boat builders.

Film on top of un-hardened epoxy? You are working with
Raka epoxy, I believe, with which I have no experience.
I've never seen this with Gougeon Bros resin. I doubt it's
a problem. All epoxy precipitates a waxy deposit as it cures.
Raka's is probably easier to see. This waxy precipitate is why it's
important to wash a freshly hardened
surface with acetone and a rag.....prior to sanding.
Else you'll clog up your sand paper.
Re: Re: Weird film on top of epoxy
January 19, 2001 11:55PM
Sandy--

If you remember I used Raka epoxy on my boat and I never did see the problem discussed.


In reply to "Re: Weird film on top of epoxy", posted by sandy on Jan 19, 2001:
>In reply to "Weird film on top of epoxy", posted by Danny on Jan 18, 2001:
>>I hope you aren't getting really annoyed with all of my
>> questions.
>
>No, no way. Every question that gets asked here
>is resource for other boat builders.
>
>Film on top of un-hardened epoxy? You are working with
>Raka epoxy, I believe, with which I have no experience.
>I've never seen this with Gougeon Bros resin. I doubt it's
>a problem. All epoxy precipitates a waxy deposit as it cures. Raka's is probably easier to see. This waxy precipitate is why it's important to wash a freshly hardened
>surface with acetone and a rag.....prior to sanding.
>Else you'll clog up your sand paper.


I didn't have this problem with my first several batches either. However, now that everything has dried up, it appears everything is just fine. It was just a little weird. I think there is a good chance Sandy's explination is accurate. By the way, after having used West System Epoxies, and Raka, as long as the Raka epxoxies prices remain as low as they are I will continue to use Raka. I have been very pleased with the results so far.


In reply to "Re: Re: Weird film on top of epoxy", posted by Dave on Jan 19, 2001:
>Sandy--
>
>If you remember I used Raka epoxy on my boat and I never did see the problem discussed.
>
>
>In reply to "Re: Weird film on top of epoxy", posted by sandy on Jan 19, 2001:
>>In reply to "Weird film on top of epoxy", posted by Danny on Jan 18, 2001:
>>>I hope you aren't getting really annoyed with all of my
>>> questions.
>>
>>No, no way. Every question that gets asked here
>>is resource for other boat builders.
>>
>>Film on top of un-hardened epoxy? You are working with
>>Raka epoxy, I believe, with which I have no experience.
>>I've never seen this with Gougeon Bros resin. I doubt it's
>>a problem. All epoxy precipitates a waxy deposit as it cures. Raka's is probably easier to see. This waxy precipitate is why it's important to wash a freshly hardened
>>surface with acetone and a rag.....prior to sanding.
>>Else you'll clog up your sand paper.
>
>


I also am using Raka epoxy, and I have seen the "weird film" on un-hardened epoxy. It's just when the epoxy sits in the mixing pot for a minute or two. It hasn't given me any problems, so I haven't worried about it.
Raka epoxy has always given me excellent results, so I haven't gone back to the high-priced stuff.

>>>Film on top of un-hardened epoxy? You are working with
>>>Raka epoxy, I believe, with which I have no experience.
>>>I've never seen this with Gougeon Bros resin. I doubt it's
>>>a problem. All epoxy precipitates a waxy deposit as it cures. Raka's is probably easier to see. This waxy precipitate is why it's important to wash a freshly hardened
>>>surface with acetone and a rag.....prior to sanding.
>>>Else you'll clog up your sand paper.
>>
>>
>
>


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