When installing the heatsink I did not notice any plastic film on the bottom of the heatsink covering the thermal paste nor was it in the manual... Now that it's on, i'm second guessing myself and I don't have any thermal paste if I were to re apply...
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More about4670k protective film stock heatsink
check your idle and load temps if they're okay then you shouldn't have to worry about it too much if anything just buy some thermal paste for ~$7 and clean the heatsink with rubbing alcohol and reapply
I think you would have noticed when you attached the heatsink by the way it would slip around if there was a plastic coating.