Steaming relaxes the felt because it helps with moisture absorption. It also reactivates the shellac in the felt when it cools. I use cool, distilled water in a spray bottle if I am doing drastic crease work. Small tweaks, I use steam. One trick is to use a bowl or large spoon to smooth out the crown back to Open Crown form. You are only steaming the felt to get it to mold easily & you still have to be able to handle it = if you are steaming it so long that it is too hot for your hands, you are doing it too long. You won't damage the felt unless you go way past this point.
Even after a drastic creasing, I'll steam the crown to set the crease by reactivating the shellac.
Hat Shaper is good for taking out hard pressed factory creases like in modern Stetsons...




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