> a wine cap could be to small to get 500ml boiled.
True. Who mentioned 500ml, though? A wine cap burner works quite nicely with a small mug, since it provides a small flame.
If you want a slightly bigger burner, use the foil cap from an olive oil bottle (remove the plastic insert first).
> And the attic insulation is mineral wool then not the glass wool kind.
I've no idea what his attic insulation is. Glass wool and mineral wool are both used, and neither is particularly fun to play with.
> Is the wick reusable?
Yes; it doesn't burn, but, in fact, acquires a firm 'crust', becoming more stable once it's been fired.
> and if so how many times?
No idea, but, essentially, it's not getting very hot, apart from a very thin surface layer; it's simply providing a large evaporative surface and fuel retaining function.
You do realise this isn't the most 'sensible' thread...?
