What you are supposed to use is polyurethane foam.
It's usually green and very easily shaped though quite messy when doing so.
Lay the glass right over the top of it and then dig it out once cured.
I've heard of people dissolving it in petrol but haven't tried that one.
Go to my weblink and you see some examples of it's use.
It's usually green and very easily shaped though quite messy when doing so.
Lay the glass right over the top of it and then dig it out once cured.
I've heard of people dissolving it in petrol but haven't tried that one.
Go to my weblink and you see some examples of it's use.