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 Post subject: Contaminated resin mix
PostPosted: Sat Jul 21, 2012 10:01 pm 
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Joined: Sun Mar 27, 2005 7:37 pm
I am curious to know if anyone else has had the same experience as me when mixing resin. Every now and again I get a bad mix from some contamination. In this video I have used some resin I already knew was contaminated from an earlier mix. I had left a small amount out uncovered for a few days. I suspect contamination came from either moisture of vapour from fly spray.

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 Post subject: Re: Contaminated resin mix
PostPosted: Sat Jul 21, 2012 10:10 pm 
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Joined: Thu Dec 31, 2009 8:54 pm
Location: Bay Area, California
Tony when you mix the two substances does it generate a highly exothermic reaction? It looks like the moisture is being boiled away.

I've had this problem with epoxies before.

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 Post subject: Re: Contaminated resin mix
PostPosted: Sun Jul 22, 2012 5:40 am 
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bmenrigh wrote:
Tony when you mix the two substances does it generate a highly exothermic reaction? It looks like the moisture is being boiled away.

My chemistry is not up to much and I really don't know. I think it is setting at the same time as giving off a gas. So there is a point where the gas struggles to get out. I didn't notice any extra heat though I didn't touch it until the end.

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 Post subject: Re: Contaminated resin mix
PostPosted: Sun Jul 22, 2012 11:53 pm 
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Joined: Fri Oct 29, 2010 9:25 pm
Location: Albuquerque, NM
Woah. Good tip to keep in mind for any casting puzzlemakers. Looks like a delayed vinegar/baking soda reaction; I doubt it was extra moisture actually being boiled. I wonder what exactly was the contaminate in this case... At least you could make a cool video out of it. :D

By the way... Red Golden Cube...? :wink:

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 Post subject: Re: Contaminated resin mix
PostPosted: Mon Jul 23, 2012 5:35 am 
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Modern-Day Warrior wrote:
Woah. Good tip to keep in mind for any casting puzzlemakers. Looks like a delayed vinegar/baking soda reaction; I doubt it was extra moisture actually being boiled. I wonder what exactly was the contaminate in this case

This is the most violent reaction I have had. A small amount of water certainly courses some frothing which is enough to ruin the part. I didn't recall this happening when I used to use polyester resin. A bad mix meant it wouldn't set properly or the surface stayed tacky.

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