Did I read it right: I can use pigment ink without a heat gun?

Yes, the ink has a soft, chalky appearance. the Strap N Tap style is easiest for this purpose. Just make sure you have enough powder on the surface of the pouch so the ink won’t dirty the pouch. Tap it on your table or storage dish to release more powder, if necessary. Then tap on the wet image. The powders instantly dry the ink enough to over-stamp without concern of bleeding & smudging, or simply leave as is. Follow with the Perfect Cleaning Cloth to remove excess powder.Sample Description