Ahh , I didnt realise you were a plastic swazzler too Chris
There's probably more of us about than we realise.
Yes the little sheet of plastic I got from the hobby /model shop in Lichfield is just the same sort as would be used in a credit card , only a thicker guage -about as thick as many of the chunkier metal swazzles I have laid eyes on ( even amoung ourselves there is still a certain shyness about 'getting your swazzle out for the lads' )
Some metal ones Ive seen are quite thin , others are as thick as my plastic ones ( almost twice the thickness of a credit card)
But the sheets of plastic come in many guages , and are used mostly for making houses and sidings for train sets I think? Certainly credit card thickness has the advantage of becoming mouldable in hot water ...I think the thicker stuff might too , if it were in a saucepan of boilingwater. But the heat gun is so simple .
The sheets are about 6 by 4 inches and very inexpensive , so anyone wanting to experiment could try a few different ones , untill they find what suits them.
As with all things swazzle related , I think that seems to be the crucial thing : finding what suits you ,
be it metal or plastic , large swazzle or small , loose in the mouth , or on cotton(s) or on a dental plate.
Untill you discover your own preference , swazzling will always be a bit of a chore , once you have it all working in your favour , it is less so.
Best Wishes Richard