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It won't work in a microwave because of the way a microwave works. The oven works by heating the whole inside of the oven to an even temperature, which will heat all the components of the plastic relatively evenly and cause it to revert to its original shape (shrink) before it was heat formed the first time. Microwaves work by causing the water molecules to gain energy essentially. It doesn't heat it evenly and won't cause the plastic to shrink at all.
At home silk screening on the cheap!
LEDs for Beginners
How to Solder EL (Electroluminescent) Wire
how to add EL wire to a coat or other garment
Halloween Gargoyle Wings
Simple Ears for Elf, Vampire, Vulcan etc
Making Faux Feathers for Costumes and Props
How to make a bald cap - SFX theatrical
Using gelatin for moulds and prosthetics
Realistic, Animatronic Lion Mask with stereo night vision and amplified hearing
World's easiest silicone mold.