I have kiln dried hickory in the past with no sticker stain problem. This was before the sap had come up in the wood. I run the NHLA schedule for 4/4 hickory (T8-D3). Has anyone had any problems with this in the past?
(Commercial Kiln Drying Forum)
From Gene Wengert, forum technical advisor:
Sticker stain develops when the temperatures are warm. This just happens to also be when the sap in the tree is flowing. Actually, there is the same amount of sap in a tree year round. Sticker stain in hickory is a frequent problem. Check the archives for more info on this stain.
Also, I am interested in your statement about the NHLA kiln schedule. I am not aware that the NHLA has any kiln schedules. For hickory, however, T8 is very hot and is not suggested when color is an issue. Did you dry green from the saw or air-dry first?