it's basically an epoxy stuff used in boating and plumbing as it stick to metal and is waterproof, and you can buy it in different colours.
I had to get some to make fake lead seals to be ripped off a treasure chest every night in a play for two months straight. Only one chipped, even though they were thrown to the floor every night.
Here they are...
www.milliput.com/
(, Thu 11 Dec 2008, 18:17, Reply)