The black and white units do not have the extra coating of paint that is affected by the oil. Chinese customs had required the additional coating of paint for all the other colored units that were in the original shipment, if I recall correctly. Robertb has indicated the 2nd shipment of the colored units do not have the "overspray" that caused the bubbling and wrinkling in this post.
https://www.mobileread.com/forums/showthread.php?t=58671
If anything, I am still being overly cautious for now.