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So I'm trying to make iron gobs out of plasticard but I can't get the plastic to bend all the way round without it either snapping or restraightening itself. I've tried using boiling hot water and hold in a flame. The plasticard I'm using is pretty thin don't know the width but only about the thickness of two sheets of paper.Can someone give a few pointers?

I made Ork shoulder armour and other bitsout of plastercard by heating a metal tube with a candle, then bending the card around the tube.Should be a cinch.

I'll try it thanks for the advice

How long did you heat the material? If it was still springing back significantly, I would imagine that the heating was only superficial. Flames can be tricky to use, as the applied heat is intense - it's not difficult to scorch/melt one side of a sheet before the other is even particularly warm.

I'd stick with the hot water, personally (less chance of mucking things up with wasteful and stinky results), and make sure that you give the pieces plenty of time to heat evenly and completely. Also, it may help to heat slightly longer strips, allowing you to manipulate the ends for extra leverage and without worrying about marring the surface (you'll just trim it off, later). Cutting the teeth afterward also avoids creating points that focus the bending stress, increasing the likelihood of fractures.

TLDR: Use even, thorough heat to form an oversized part, then trim to shape.

HOT WATER.

My HE chariot body was 1mm plasticard sheet and rod. Cut to size, then shaped using boiling water (I dunked it into the water for about 30 seconds, then removed it and carefully formed the curve.

This next bit is the key part. I then dunked it into COLD water to set the curve.

Basically you need to get the piece heated up over 90 degrees C, form the curve, then cool it.

This is best achieved with water rather than a flame, since water cannot set fire to plastic or melt it.

Thinner sheet can be formed while cold and put into hot water to make it hold the curve.

Another way to do it is by holding the piece in the jet of steam from a boiling kettle. This can be useful when you want to bend a discrete area of the piece and keep the rest of it rigid.