In a message on Sun, 26 Feb 2006 13:28:02 -0800, wrote :
DN> greybeard spake thus:
DN> > IN process of making mold now, water tank, actual dimensions about 1 inch
DN> > across and equally as high, wood tank,but I need more than one and
DN> > downstairs at the mill scribing the board lines isn't what I want to do.
DN> > Ok, wood form made, but now comes the question, what medium to mold them
DN> > I'm leaning toward hydrocal, cheap and easy to work with, even after it's
DN> > cast. They won't be touched once they're in place, part of the scenery,
DN> > out of the way places. Not elevated, they stand on squat poured
DN> > foundations, elevation comes from the hill they're on, above the residence
DN> > they serve. Hydrocal good? Resin? (IF resin, that means I've gotta make
DN> > plug to fill part of it, that would be a lot of resin.)
DN> So why do model railroaders automatically think "Hydrocal (R)(TM)" when
DN> they think of casting things?
DN> Use ordinary plaster (plaster of Paris); it's cheaper, available
Hydrocal in 80lb bags is as cheap (if not cheaper) than plaster of
Paris. *Serious* model railroaders don't buy the silly little cartons of
Hydrocal from Woodland Scenics :-). I got me a big bag of the stuff
from a 'local' masonary supply place and have it sitting in a moisture
tight bucket (originally meant to hold Chlorine tablets for pool cleaning).
DN> everywhere (no need to go to a hobby store) and works just as well for
DN> most applications. Sure, it may not be quite as rock-hard as the more
DN> expensive stuff, but since you say it won't be handled, no problemo.
DN> Takes paint extremely well.
DN> As the other reply said, just make sure you have a stretchy-enough mold.
DN> Either RTV or urethane ought to work OK here.
DN> One trick I learned: to prevent the inevitable bubbles, brush the mold
DN> with alcohol (rubbing alcohol is fine, or isopropyl) before casting.
DN> This wets the mold so bubbles can't form.
DN> To the arrogant putzes at NBC:
DN> Do we call the country Italia? Is its capital Roma?
DN> Were previous Olympics held in Moskva, Muenchen or Athine?
DN> Do we call it the "Shroud of Torino"?
DN> So learn to speak English already and call it Turin.
DN> - from someone's blog
Robert Heller ||InterNet: email@example.com
http://www.deepsoft.com/ ||FidoNet: 1:321/153