OHH Damn ! Thanks Scott for the Informations!
1. Yes i use 2 different kinds of Plaster the first Plaster is for the Details a kind of Relief plaster from the Hobby Shop! Now i use Plaster of paris, then i make a layer with Plaster bandages ! Now i let i dry for 3-4 Days and then the next layer Plaster of paris, 3 days Later the last 2 Layers of Plaster Bandages !
Stick with one plaster. Not sure where you are (I'm assuming overseas), but here's a link with a variety of Euro suppliers. I clicked on a 3 or 4 of them and did find a couple with gypsums that sound very similar to Ultra-Cal 30. You might also try contacting USG to see if there are any Euro distributors of Ultra-cal. Here's the link:
Links to suppliers
Also, ditch the plaster bandages. Burlap is available at probably any hardware store (usually in the gardening section) in large rolls and is far cheaper and far stronger. You'll likely need a roll that's about 12 meters x 1 meter wide... Cut it into small strips, say 6" x 3". You'll want the detail coat maybe 1/4" thick. With a mold this size, I'd start mixing my next batch of plaster as soon as I finish the detail coat. You'll be dunking the strips into the newly mixed plaster to soak them thoroughly, then apply them... you'll repeat this process 2 to 3 more times to build up the thickness to 3 to 4 layers. Let the plaster set up until cold to the touch, then you're ready to do the other half.
The only time I use vaseline is on the flanges, where the mold halves meet. I don't vaseline the sculpt. A couple coats of Krylon's Crystal Clear Acrylic spray paint is enough to protect the sculpt as well as serve as a release agent. I do make sure to get plenty of vaseline on the flanges and down into the key holes making sure that no raw plaster on the flanges is exposed.
The detail layer of plaster has not connect with the other Plaster Layers ! The detail Layer broke out of the mold over all
Most likely due to the fact that you're using two different plasters as well as you're waiting until the plaster sets to continue adding layers. You'll want to set aside enough time to do one entire side, detail coat, and 3 to 4 layers of burlap all in one setting.
What is Ultra cal? And what is Crystal Clear?? Did you mix the hemp under the Plaster ? It is very difficult for me to find the same Stuff that you have to work Scott!
Ultra-cal maybe a bit difficult to find, but something similar will suffice. Crystal Clear is a clear acrylic spray paint made by several different companies, but I prefer Krylon. Most likely, this or something similar is available where you are. As mentioned above burlap shouldn't be hard to find and once cut into strips, it's dunked into the plaster to soak it, then apply it.
What is with Latex for realese agent ? can i use Latex??
If you use the Krylon Crystal Clear, you won't really need a release agent, but if you feel more comfortable, by all means use vaseline. I guess it may also depend on the clay you're sculpting with. The Kleen Klay that I use is medium firmness, but compared to Chavant medium, Kleen Klay is just a wee bit softer. If you're using firm or extra firm clays, then you might want to use the vaseline on the sculpt, but I never have to with Kleen Klay... So I guess to be safe, go with the vaseline since I don't know exactly what you're using.
What is with a fiberglasmold? I found stuff it call´s "Elastohaut" it is a 2component Latex that would dry in 5 minutes !
or is it better to use plaster ?
You'll need a stone mold if you're casting in latex. The reason for this is that for the latex to cure properly and evenly, the moisture needs to be removed from it. The porousness of the plaster allows this to happen. Plastics, fiberglass, etc, are not porous enough for latex to cure properly. It will air cure to some extent (i.e. the latex that cures in the plastic container), but you won't get even coverage throughout the entire mold. It might work in a plastic or fiberglass mold if you had enough latex to dwell it in the entire mold, but it would take a LOT of latex fill a dwell that size and probably take quite a few dwellings for even coverage and even then, likely wouldn't turn out like you hope... stick with plaster.
Scott thanks for your help !!
