Hard coating for soft surface Say I have a soft, possibly porous object. I want to coat it with a material,


Resistant to boiling water and some scraping
Not hazardous, at least after the coating
Largely transparent


The idea is to take, say, a fruit with the insides removed and to make a cup or a vase out of it.

Is there something I could buy or make at home for this?
You could vacuform heated thin PET film over it.  That would not stop biology.