After completely coating the inside of the through hole with ink, the ink needs to be cured in the oven.

You can use a toaster oven or a kitchen oven.  I used a laboratory oven I purchased off EBay.

To cure the ink:

• Cure the PCB, for 30 minutes in an oven preheated to 100 degrees Centigrade.
• When the time has elapsed, use "oven mitts" to CAREFULLY remove the board, from the oven and allow to cool to room temperature.
• Carefully inspect all of the holes one last time to insure that no blockages have formed. If some of the holes are occluded, use a small drill bit to remove any debris or ink plugs. Try not to scrape the walls of the hole. The less you disturb the holewalls, the more like you are to have 100% coverage during electroplating.
• The board are now ready for cleaning and subsequent processing.

Supplies

• An oven preheated to 100 degrees centigrade.
• Oven mitt

Tips

Carefully inspect all of the holes one last time to insure that no blockages have formed. If some of the holes are occluded, use a small drill bit to remove any debris or ink plugs. Try not to scrape the walls of the hole. The less you disturb the holewalls, the more like you are to have 100% coverage during electroplating.

LabLine Model 3510