Fill for Engraved Metal

[Billct2]

I have a buddy who has some metal parts that were engraved. He wants to fill the engraving with black and maybe silver or gold. He described a materail that he's seen used that isn't paint, more like a resin, that is heated an used to fill the engraved letters. It has to be outdoor durable. Any idea what the materail may be or where to look for it?

 

[CanuckSigns]

He's referring to paint sticks, they are similar to crayons, I hate using them, I prefer a good enamel paint when we engrave tags, spread it on with a business card, get as much off before it dries, then after it dries, do a final clean with acetone.

 

[Billct2]

Yep, that seems to be the consensus. I did some searching and found some good tips on a web site for gun refinishing.