I prefer to refinish sticker tires to remove the mold release if we're not scuffing them in on the track.
It helps get the prep down in the tire faster. It also doesn't push the mold release down in the tire with the prep.
If nothing else, clean/scrub the surface with acrysol or a good tire cleaner, Pro-Blend, White Dragon Grip, etc to clean off that film and open the tire up before applying prep.
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Thanks and God bless,
Brian Carlson
Carlson Racing Engines
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32 years of service to the karting industry
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bcarlson@CarlsonMotorsports.com