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Has anyone used actual fabric or gauze etc to make purity seals/heretical scrawlings?

I remember the practice of using fabric for banners back in the day for Fantasy armies but can't remember what was used.

Any advice would be much appreciated.

Nothing to offer from personal experience, but I've heard heavy duty aluminum foil is a fair option, especially (I'd imagine) if it's mounted to a model's surface as opposed to hanging out in space.

I've been using cut up aluminium drinks cans, a very very good thing to use IMO. Done a lot of similar stuff with green stuff and PVA-soaked paper; aluminium is by far the easiest and best option. Free-standing sections can be a little fragile, but you can layer up milliput or green stuff on the back of it to give it strength. Alternatively you could buy so actually aluminium sheet as the above poster mentions, and go a little thicker.

Interesting. I've never tried aluminum before. I'll look into it. Thanks.