I had the fumarate salt. I used 2 parts 4-HO-DPT to 1 part baking soda. I calculated the molar masses, which gives a ratio of 3.78 to 1, but I figured it wouldn't hurt to use an excess of baking soda. It reacted in seconds without heat, then I slowly heated the spoon with a lighter to evaporate the water. I would heat it a little bit at a time, then stir it, causing the 4-HO-DPT to clump up. I ended up with a lump of 4-HO-DPT paste in the middle of the spoon.
I'm starting to think that vaporization is a very effective method for all tryptamines. Most people say it's not very efficient for 4 substituted tryptamines, but I think that's just because they are normally found as salts. There are reports of people successfully vaporizing 4-HO-MPT that was sold as a freebase. I think I read somewhere that Alexander Shulgin tried vaporizing psilocybin or psilocin and it worked. I have vaporized metocin and miprocin in their fumarate salt forms and I got some effects, but less than if I had taken it orally. I think as a freebase it would work pretty well.