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Casting resin parts

RELATED TOPICS: RESIN
Q: I recently tried my hand at casting resin parts, and I’ve been generally pleased with the results. However, in my last couple of pours, the parts never really dried and were rubbery.  

What happened?  It’s discouraging.  

Ben (no last name)

Ken: We certainly understand your frustration, Ben. Casting is a daunting task that requires patience, attention to detail, fresh material, and an eye on the weather.  I’ll explain:

The “patience” part is self-explanatory.

“Attention to detail” means that your measuring needs to be precise. The resin you said you’re using is a 1:1 mix, and they mean it. Any variation in either part can mess up the mix.  

If possible, use a sensitive scale (a postal scale or laboratory balance) and carefully weigh each part in identical cups. Weigh the empty cups first and work that number into your total.  

Pour Part A and Part B unit into a third cup for the final mix. That will further ensure equal weights of each part.  

“Fresh material” means just that.  Resin has a definite shelf life, and the longer it sits, the more chance there is for it to absorb moisture from the surrounding air,

Which brings us to ...

“An eye on the weather.” Mixing and pouring resin on a humid day can affect the mix.

More moisture in the air means the possibility of more moisture in the resin, which can cause the parts to stay soft and rubbery.  

That’s pretty much a quick overview of the casting process, and a general answer as to what could have gone wrong with your failing attempts.  

Here’s another quick tip: There are an infinite number of weight/age/moisture issues that can affect your parts. Keep a notebook outlining exactly how you mixed each batch of resin, what the weather was that day (seriously) and jot down how the pieces turned out. That recordkeeping will go a long way toward helping you get consistent results.

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