Casting question

Casting question
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Custom WorkstationOk, so I've been trying to cast six inch heads every once in a while the last couple of years to moderate success. Sometimes I get the Walking Dead results where the lower jaw is missing from the cast, but the most frustrating thing I've noticed is when a cast looks really good except for the dreaded nose bubble at the tip of the nose. Anyone have any suggestions and what to do to stop this from happening? Not sure what I'm doing wrong but it seems like over 50% of the time when the cast hardens I get a nose bubble and other times I don't.

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The only thing different I did is I added a moisture filter that goes between the connections for the compressor and the pot, I guess this helps to make better casts and molds. The last thing I did different is I replaced the bolt on the end with another plug to release air. That way if you do put too much pressure in there (honestly, stop at 50 psis when casting), those plugs will allow the air to escape vs blowing up in your house or garage.
Also, do not use the pressure cookers that some people use on Youtube. I heard that you are saving a little bit of money but don't really last that long.
Good luck. Hit me up if you have any more questions.
I recommend 327 which takes 2-4 hours. This allows the resin to settle it and bubble to work their way out. Sucks that it takes to long but the results tend to be better.
Another tip that a fellow caster gave me is putting odor baby powder in your mold before you put the resin. I don't know why but it sucks the resin right in. I just squirt some in the mold, shake it, and then blast the excess out with my airbrush.
A pressure pot is going to run you about $800 (last I checked) if you buy one straight off the market. I built one, with the air compressor, for around $200 (the compressor was half the cost if memory serves right) with supplies from Harbor Freight. If you catch them on a decent weekend, Harbor Freight has a some solid sales. I think I had to buy one or two parts from Lowe's but they both totaled for under $10.
The only pain that I had building it was making sure that all the air holes where you seal everything get's sealed up with the tape and such. If you just fill up a squirt bottle with 50% water and 50% dish soap, fill the pot with air, and squirt the water over areas where parts are connected, you should see bubbles forming and that tells you where your leak is.
Yeah, it's tough. I've only made a few casts with liquid latex. I don't get bubbles because I brush on the first few layers of latex and let it cure, then I pour the rest since it doesn't matter if that has bubbles because the outer shell is already perfect.
From what I understand, putting the stuff in the pressure pot to cure simply makes any bubbles so tiny that they become microscopic. It also forces the casting material into all the mold's crevices so the bubbles are shoved out. There's another process called "degassing" but you'll have to ask someone like the people at TCP Global for specifics. The pressure pot itself is like $100, and then you need an air compressor too of course.
Aside from that, a pressure pot seems to be the guaranteed way. You can also try getting a strong back or foot massager and pressing it onto the mold so it vibrates the bubbles out.