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There has been a lot of discussion about mold cracking here. My theory is that the molds crack either from stress- i. e. not strong enough molds to hold the glass (which does not sound like yours) -OR- that the molds are not dry when you fire them. You may want to thoroughly dry your mold in the kil...

Jerre-

I forgot to ask what is " Back Magic"?? And what is your resource for it?? thanks!

Jerre- An artist I studied with, Ruth Brockmann, uses a 5-2-2 mold formula that produces a good finish. Its 5 parts Hydroperm, 2 parts Silica, 2 parts Hydrocal and 6 lbs of water (parts are by weight).The silica helps the release from the mold. You can also throw some chopped fiber glass strands in ...

Thanks Barbara!- I will come to that meeting. I am looking forward
to meeting him and seeing his presentation! - .

First of all- what kind of mold material are you using?? Some of the issues can be in the mold material. You want to cast into something that gives you a good finish to start- AND what temp are you casting at? If you are over firing- it affects the casting surface. I make cast glass jewelry set into...

Since noone replied to my message- one has to assume y'all have no idea what I am talking about because the product " Castalot" is so new that none has tried it yet. So my advice to serious kiln casters is to check out this new "Castalot" mold material developed by Michael Dupill...

Anyone tried the new product called Castalot?? (a re-useable mold material that can be used for mulitple firings) So far I have turned up with 5 repeated castings from the first molds I made but I havent been satisfied with the finish on the glass. The manufacturer recommends using kiln wash to coat...

Hi Rodney- I would recommend you only doing casting on one level ( ie- dont stack the molds onto different platforms) but fit as many as you can as long as they arent touching. (Its generally good practice to arrange multiple molds in the kiln in an even arrangement so heat is distributed evenly thr...