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Bubbles
Jun 30, 2017 13:57:22 GMT -5
Post by otdrzman on Jun 30, 2017 13:57:22 GMT -5
Hello. I'm new to the forum and also relatively new to resin casting. I'm hoping one of you pros here can answer a question for me. I started tinkering with making some fishing lures out of resin. I am using the amazing white and micro balloons with a two piece silicone mold. The problem is that I am getting bubbles formed along the back of my lure. I have done some research and see where a pressure chamber will eliminate the bubbles. I also read that it doesn't necessarily remove them, it basically crushes them to microscopic size. So, here is the question. I am having problems with consistent sink rates due to the bubbles that are formed in the back of the lure. If I cast them under pressure will I still have the inconsistencies due to the bubbles not actually being removed but just crushed to microscopic size? Maybe I'm overthinking it but it just seems to me that I will just be taking large bubbles and making lots of smaller ones. Technically no change. Thanks for any info that you can offer.
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Bubbles
Jul 3, 2017 10:03:03 GMT -5
Post by mike on Jul 3, 2017 10:03:03 GMT -5
The volume of the big bubbles that are crushed and turned into microscopic bubbles are replaced by resin and microballoons which will make your bait heavier (as the resin/microballoon combo is heavier than the air it is replacing). So yes, it will change the density of your lure but every lure will be MUCH more consistent from pour to pour eliminating or greatly reducing the inconsistencies your are experiencing.
Mike
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Bubbles
Jul 3, 2017 13:55:42 GMT -5
Post by otdrzman on Jul 3, 2017 13:55:42 GMT -5
Is it possible for the micro balloons to crush under 45 psi of pressure? I tried to cast a couple lures under pressure and it left a large void in the top of the lure as if the bubbles had crushed/collapsed. It completely drained the pour hole in the mold.
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Post by mike on Jul 5, 2017 8:41:18 GMT -5
Its not the microballoons being crushed but the air that is stuck in the resin/micro mix. Because the viscosity is higher, much more air will be introduced and trapped in the mix when you pour it and the amount of volume required to displace is much higher. When you pressure cast it, all of that air is minimized to practically nothing. Best bet is to simply cut a bigger reservoir for your pour hole. If you can't cut it any bigger, make a dam using clay or tape around the top in order to provide more mass to pull from.
Mike
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Bubbles
Jul 6, 2017 10:52:46 GMT -5
Post by otdrzman on Jul 6, 2017 10:52:46 GMT -5
Awesome. Thank you sir
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