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Mold Max 14NV 25 or 30?

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Re: Mold Max 14NV 25 or 30?

Postby mangozac » Mon Nov 24, 2014 9:23 am

paulson games wrote:Heaps of great advice

Thanks Jon, that's some fantastic advice in there, especially applicable to the problems RageofAchilles has had. R0A, what temperatures have you been doing your casting at?
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Re: Mold Max 14NV 25 or 30?

Postby RageofAchilles » Tue Nov 25, 2014 8:17 am

Well, it would seem that my garage is totally the wrong environment for Vacuum casting.

In the summer when I first got my kit, temperatures were 25oc with 90%+ humidity

Winter has set in now so it will be really difficult to keep my garage above 15oc while I'm in there. Plus with all the rain we have been getting in the UK, I'm pulling 2-5 litres of water out of the air each night with my dehumidifier!


No wonder I get foaming resin and trouble with curing.

I do have a halogen cooking pot that I bought for curing minis sculpted with Fimo, I will pop some resin in there at 30oc or so while it cures and see what happens :)
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Re: Mold Max 14NV 25 or 30?

Postby mangozac » Tue Nov 25, 2014 9:31 am

RageofAchilles wrote:Well, it would seem that my garage is totally the wrong environment for Vacuum casting.

Wow that's an understatement!

How is it that your humidity was so high? I didn't think the UK had high humidity?

Is it safe to assume that inside your house is a much more stable environment? If so I would suggest doing some tests casting inside the house (make sure your significant other isn't home at the time :P). The fumes from just a couple of mixes of polyurethane are going to be minimal and I certainly wouldn't be concerned about long term effects.
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Re: Mold Max 14NV 25 or 30?

Postby RageofAchilles » Tue Nov 25, 2014 12:46 pm

mangozac wrote:How is it that your humidity was so high? I didn't think the UK had high humidity?

Our summer weather comes from the gulf of Mexico on the gulf stream. The same weather in winter is just rain, rain and more rain so there is always water in the air no matter what. Add to that, I live about 200yards from the sea on the south coast ;)

It could be worth me trying some indoor casting as you suggest, i'll have to be sneaky about it lol
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Re: Mold Max 14NV 25 or 30?

Postby Fleafa » Wed Nov 26, 2014 2:46 am

I am also on the south coast of the UK (Portsmouth) and have had some of the problems you are exhibiting but nothing like as bad. My current workshop has a leak in the roof above the casting table and I'm still putting out saleable casts. S-C305 and various silicones.
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Re: Mold Max 14NV 25 or 30?

Postby RageofAchilles » Wed Nov 26, 2014 11:33 am

Hi Fleafa, your only about 25 miles from me (Felpham, Bognor Regis).

And yeah it is extreme. I have been resin casting for about 8 years now and white metal casting for 12 years before that, just for myself. I only encountered the problems seen in the pic when using the Vacuum chamber...A problem that does seem to be more pronounced when I use a pigment in the resin. Also the parts I make are quite large, which dosen't seem to help. I did just get some perfect casts out of a new mould without using the chamber, or adding pigment to the resin. So there is hope I think ;)
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Re: Mold Max 14NV 25 or 30?

Postby mangozac » Wed Nov 26, 2014 12:57 pm

What pigment have you been using?
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Re: Mold Max 14NV 25 or 30?

Postby RageofAchilles » Thu Nov 27, 2014 6:27 am

So-strong pigment. Recommended for use with smooth-on products.
http://www.benam.co.uk/products/plastic ... ng-9-pack/
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Re: Mold Max 14NV 25 or 30?

Postby Fleafa » Thu Nov 27, 2014 5:36 pm

I am baffled! :)
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Re: Mold Max 14NV 25 or 30?

Postby horizon » Thu Nov 27, 2014 6:02 pm

So actually you two could meet up and could try to work out the problem together it's it keeps persistent.
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Re: Mold Max 14NV 25 or 30?

Postby RageofAchilles » Sat Nov 29, 2014 11:46 pm

horizon wrote:So actually you two could meet up and could try to work out the problem together it's it keeps persistent.


While the advice I've been getting here is very helpful. I certainly wouldn't impose myself on another forum member like that .

It's certain that the environment of my garage , the low power of my Vacuum pump, the incompatibility of my silicon moulds and the lack of a pressure chamber are all factors in the problems I've been having casting larger kit parts. It's just going to take time and considerable investment of funds to sort it out.

Many thanks to everyone for their time and valuable advice:)
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Re: Mold Max 14NV 25 or 30?

Postby Fleafa » Sun Nov 30, 2014 11:08 pm

I'd be open to such an idea in the new year. Crazy busy before then :)
Sounds like you have more experience than me, anyway.

What power is the vacuum pump? That and no pressure would explain the fine bubbles to me. I have no experience with the anti-foaming additive.
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Re: Mold Max 14NV 25 or 30?

Postby RageofAchilles » Mon Dec 01, 2014 3:00 am

Fleafa wrote:What power is the vacuum pump? That and no pressure would explain the fine bubbles to me. I have no experience with the anti-foaming additive.


It's only a 1.5cfm . It was included in a starter kit with a 7.5ltr Vacuum chamber. I know I should be using something like a 6cfm pump but at £200-£300 it's just out of the question. I have a clear idea in my mind of how to sort things out now, I just can't afford to do it lol
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Re: Mold Max 14NV 25 or 30?

Postby Fleafa » Mon Dec 01, 2014 6:21 pm

RageofAchilles wrote:It's only a 1.5cfm.


Yup, that could be one problem!
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Re: Mold Max 14NV 25 or 30?

Postby dce1511 » Sun Dec 25, 2016 12:19 pm

RageofAchilles wrote:So-strong pigment. Recommended for use with smooth-on products.
http://www.benam.co.uk/products/plastic ... ng-9-pack/


Not certain if this thread is still active, but just stumbled on it, and thought Id add a note to this particular section.

I had unexpected bubble and brittle issues with a new batch of resin, in spite of both vacuum and pressurizing. Turns out So-Strong pigments also have a limited shelf life. The bubbles where caused by moisture introduced by the pigments. Even in the small amounts of pigment used, the moisture content reeked havoc.
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