Soo I have decided to make the armor out of PETG i've seen a fellow cosplayer use it with a heat gun to make a successful chest and back piece and I hear too many horror stories about worbla here's a Picture of the success with PETG
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From-rawrbomb
Sent from my iPhone using Tapatalk
That's my Armor in the picture.
I ordered a roll of transparent Worlba, and it's still sitting in the shipping container. I'll probably use it for some other project down the road.
The PETG worked great, The .040" forms very easily by hand over the top of the armor. I've tried messing with thinner PETG by forming a 2 liter bottle. I think that any thinner than .040" deforms from hard to a giant mess very quickly.
The PETG is pretty brittle. You can't score and break like you can with styrene. I'm finding that cutting it with some heavy scissors has been the best.
First, make sure you have gloves to cut down the heat a bit. I precut the plastic to roughly the shape (+2-3 inches), then used the heat gun to slowly form the armor from the middle outward. I just pushed the plastic as it heated slowly into the grooves, then when it cooled it holds it's shape really well. It still has some flexibility, and it seems durable enough.
The edges I've done by drilling holes along the entire outside. Then sandwiching Worbla on the edges into the holes for a solid hold. The glue on the worlba actually adheres a bit to the PET-G, so the edges are very firmly secured. After that I layed a strip of fabric on my work bench, put some worbla into the fabric, Turned in the edges, and then wrapped the edges a second time with the fabric secured Worbla. I'll upload some pictures of this process to see if it's useful to other people.
To finish the armor, I lightly sanded it with a sanding sponge to make it opaque. If you sand too much, a low heat setting on the heat gun makes it transparent again. Then I just hand painted it with acrylic to make the muscles more defined.
Also, In some scenes his armor is only backpainted with a light yellow ochre, In other scenes it's much thicker ochre with some darker browns mixed in. So painting it either way is probably "canon"
Edit:
I will add that hand forming with a heat gun is a quick and dirty process, and you can get a single curve very easily. I did every part of the armor except for the shoulder bells just by hand forming. Since those are more domed, they don't hand form easily. You can probably hand form a dome, but it would be very slow and prone to problems.