Yes, you can use a plastic cover for PEMF without interfering the usage. For ultrasound, it is also possible, but it will interfere with the usage in a minor way.
You don't need gel for PEMF because PEMF is a non-contact mode. There is no electrical current flowing from the coil to the body. For ultrasound, you should use a gel to enhance the contact.
For more details, please check the link:
http://www.spooky2.com/forums/viewtopic.php?f=23&t=5010
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