Date: Mon, 29 Sep 2003 12:33:23 -0500
Subject: Re: PUPT: Ultracal vs. Plaster... bubbles
From: Mike Brose <propworks-AT-juno.com>


That's been my experience as well. Neoprene can form bubbles very nicely
if poured from any height above the mold at all (the deeper the mold, the
worse it can be). I've found it helpful to tip the mold at an angle and
pour slowly as close to the mold opening as possible (as well the other
techiniques Jim mentioned). That way the neoprene is running slowly down
the side of the mold instead of splashing and causing bubbles. That has
worked well for me at any rate. 

Cheers,

Mike Brose
www.puppetsandprops.com

On Sun, 28 Sep 2003 15:53:45 EDT Jimsan777-AT-aol.com writes:
> Bubbles in the mold are caused by air in the mixture...bubbles in the 
> cast  are caused by pouring neoprene too quickly.   Some pour the mold 
> half full, then  rotate it around to cover the inside, then pour off
the neoprere and 
> set the  mold aside for a few minutes, then refill the mold.   I just
pour 
> the neprene very slowly at first.   But you can patch holes with
plastic 
> wood...the new  water base stuff works well.   Jim Gamble


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