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Dan Spector
Joined:
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02-Jan-2008
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Started On : 30-Sep-2009 at 11:56:03 PM, #Views : 5886
Topic Subject : Re: Re: Re: Re: Re: Re: Pregnancy cast |
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My hydrocal is so strong, i can't imagine how strong dental plaster
must be. Hcal is so hard I can't really rasp it once it's reached
full strength. Is yours that hard?
When i want to add a wire or hook, I sand off the finish, if any, on
the area to be added to. Instead of totally soaking the piece, i
sponge it with water several times. Then it's OK to laminate more
fiberglass mat dipped in hydrocal on that area, trapping a lasso or
hook of galvanized wire for the hanger. i rub or "felt" the patch as
it's hardening.
Dan Spector
dan@archicast.com
On Sep 29, 2009, at 4:05 PM, aliforum@lifecasting.org wrote:
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> Hello Dan Spector
>
>
> Post Date : Tuesday 29th 2009f September 2009 04:57:21 PM
> Posted by : "Diane Rossong" Diane@lastingimpression.net
>
> Re: Re: Re: Re: Re: Pregnancy cast:--
> I did that one in 2003 and put it on my website in 2006.
> The hands turned out way better then the belly, not knowing what I
> was doing, I almost filled the belly with gypsum, I later had to
> take a grinder to the inside and hollow it out a bit so it didnâ
> €™t weigh so much.
> It sounds like you have had some practice for it.
> It does take courage to submit to this website, afraid of ridicule
> …
> But recently there has been a ton of interaction, I think for about
> a year no one really used it, it’s great to see people using
> it again.
>
> It looks like your mold collapsed a bit.
>
> I can only say what I do, and my experience with different products
> has been important for me.
> When I first started doing this I used a pretty expensive dental
> gypsum, then found out about Hydrocal white, even though it is
> quite a bit weaker the cost is way cheaper.
>
>
> One thing that is good to know, is that if you take the dust of
> precast gypsum (from sanding) and put it in your mix for the mother
> mold it will accelerate the cure time. I found it was great when I
> was using the stronger gypsum, but when both powers were from the h-
> cal it seemed to weaken that mixture (to me) and I only had to
> experience one of my belly castings to spread out of shape because
> the mother mold was too weak.
> I also had no idea how much of this powder to put in the mix, it
> either set too fast or too slow.
>
> So this is what I do now.
> When the alginate is almost set I put on some fluffy fibers on
> them, then mix up a batch of the silky rock ( 13,000psi) it is also
> a fast setting gypsum 10 min set. and then put it on with a paint
> brush in the areas that need to be the strongest to hold it’s
> shape like around all sides (pregnant belly) especially under the
> belly and around it under the breasts. Then a thinner layer
> everywhere else. I get some cheese cloth, I don’t like
> plaster bandages because I feel they are not strong enough, they
> are too small, but the big reason is because it takes too long to
> work and put on the mould properly. I have the cheese cloth set
> aside ready for me to use. You can cut it into pieces quite big and
> it only takes a minute to put on.
> Then I mixed up a batch of extra fast setting gypsum I bought it
> especially for this stage. It is the same strength of h-cal and the
> set time is 5 min, with a working time of 2-3 min. I tried this the
> other day, I put a plastic spoon on my drill and used it to mix
> that batch and in a deep bowl, it worked better than I thought. I
> brush that on also, and with this stuff I know what to expect time
> wise.
>
> With the sloshing part I just take a wide paint brush and paint on
> the gypsum into the mold, as it starts to harden you just keep on
> brushing it on and you can rinse your brush then take some cheese
> cloth or fiber glass weave. And so on…putting on layers.
> Depending on what you are using determines how thick you want the
> cast, the silky rock I am using only needs to be ¼ - ½â€Â
> depending on the area of the cast, and it is as hard as a rock.
> Apparently the forton mg only needs to be thin as well.
> I hope that helps, hopefully I explained it good enough to
> understand, and of course everyone comes up with their own way of
> doing this so whatever makes you most comfortable.
>
> Diane
>
>
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