File puptcrit/puptcrit.0707, message 181

To: <>
Date: Fri, 20 Jul 2007 02:49:46 -0400
Subject: [Puptcrit] TECH: speeding Latex with vinegar: results

I've gone to a full size mold, and tried various approaches.

What works: spraying (with a spray bottle) white vinegar in the unsealed 
plaster mold generously, then pouring the excess vinegar out. The plaster 
absorbs the vinegar and now it is acidic on the surface, meaning it will 
make a thin coat of latex cure instantly. I  make sure there is no puddle of 
vinegar anywhere.Then I pour rubber latex inside the mold, swish it around 
untill all is coated, then pour out the excess into a separate container 
(with lid). I leave the mold upside-down to drip all its excess latex away, 
then I put it face up again. The dripping is necessary to avoid thick 
gatherings in deeper areas.

It takes 5 minutes for that first coat of latex to cure. That coat is 
thicker than if I had just let it air dry, so it is indeed a timesaver.

The next layers are applied in the traditional way (pour latex, swish, pour 
excess out), with no further use of vinegar.

What does not work: vinegar sprayed between layers: too difficult (with a 
spray bottle) to apply evenly and thinly enough. I unvariably end up with 
uneven puddles of latex, as it only speed-cures on contact with the vinegar, 
and that means instant skining (thin), leaving uncured latex captured 
underneath. Bursting one of those pockets is probably as strange and 
disgusting as popping someone else's HUGE pimple (never tried the latter, 
never wanna).

The first try in the child-size mold was ruined because the first layer had 
puddles of latex, and the second cured on top of them, forcing me to burst 
the many latex bubbles, which caused the cast's surface to warp and wrinkle. 
Thankfully, I was curious and pulled it out to see before adding more and 
wasting latex.

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