Titan figure head shrink

Posted in Custom Workstation

Hi

Can anyone please help me towards guiding me with the shrinking process, material and duration of a titan figure head ? Each of those figures are 3" vinyl figure. I am really hoping to process some characters' head for 7 inch figures. I have looked all over but there is no tutorial for head shrinking processes. Any help would be really really appreciated. Please let me know , would be really really grateful.

https://www.titanmerchandise.com/americ ... tion-sing/