Desos said:
but once you melt the dmt into the herb can you just burn the herb like normal? it seems like that would burn the dmt rather than vaporising it.
Desos - Here is the deal: Ideally you don't want to melt the spice into the herb. What you really want to find is that perfect point of where the spice starts to vaporize AS it's melting. Some of the bottom layer of spice will undoubtedly melt into the herb, but hopefully you can get most of it as vapor. This is an EXTREMELY hit-and-miss technique however, hence why most people suggest ash as opposed to herb. Ash is denser and more compact, as well as less absorbent than herb of any kind, so the spice is much more likely to "float" on top of the ash and vaporize properly instead of melting in. To answer your question though, once the spice is melted into the herb, you really don't have a choice but to just fire up the herb. Yes, you will burn the spice if you do this, and you'll likely get a very harsh hit, but you will at least get a hit, possibly quite effective, but realize that you will also waste some of the dose and put your lungs through trauma that isn't required.
Honestly, if you really want to do it right, as others have suggested, you need some kind of bulb-type glass pipe that you can heat from the outside and gently warm the spice to vaporization point. Lacking any specific type of freebase style pipe you can also use a bulb style glass herb pipe, BUT you load the spice inside of it (in through the carb hole) and heat the bottom of the glass to vaporize the spice. This can work quite well actually.
As far as your bong goes, I'm sure it understands what you're going for here, and I can't imagine it will feel "cheated on" simply because it knows that it's not meant for this specific purpose. I think it will support your use of another tool! 8)