http://thesuperherocostumingforum.yuku.com/topic/1921/The-Plastic-Thread#.UsruG_RDs9Y was a thread that mentions a moldable plastic, sintra. I found Instamorph, what I'm guessing to be the equivilant of sintra plastic, on amazon.com for super cheap.
Compared to worbla or sintra it's more economical. As a beginner to plastics and molding my own armors I wanted to go the cheap route.
This instamorph plastic does require that you melt it and roll it out into a sheet yourself, but I figured I could do that. With work, it can be done. It took some patience. I had to heat the water to almost boiling. Once the white beads turn clear you know it's ready to mold.
I took the plastic glob out of the pan of hot water and started rolling it into a thin sheet. No problem. The hard part is gently placing it back into the pan of hot water without letting it stretch. Since it's melting it will stretch and cause the sheet to be thinner in some areas than others. You can be patient and just use a blow dryer on the counter top instead of sticking it back into the pan. A blow dryer on the counter where you are rolling it into a sheet is the safest way to ensure a uniform thickness.
LARGE pieces should just be heat gun melted and rolled out on a granite slab.
word of caution: This stuff sticks to some stuff instantly. Stuff it sticks to:
itself, teflon, other plastics!
Stuff it does not stick to:
laytex, cerarmic, granite, aluminum, marble, steel, hands
It is best to cut out the shape you want from the sheet you created when the plastic is warm.
Once the plastic is cooled it is hard as a rock and a total pain to cut. This does not shrink up like craft foam when heated.
https://www.facebook.com/media/set/?set=a.684634294890578.1073741826.100000320426113&type=1&l=18346cb458 <--- pictures here!
I'm hoping to slowly melt this plastic into the bra shape, in the oven. I hope that gravity will take over. Wish me luck!
This works great with a heat gun!