This question got me thinking. Straight of the bat my answer is yes. But plastic lures are usually played not as slow as most soft baits are. Tricky, hmmm… Well, yes. One can most certainly use scent on hard bodied lures. This includes spoons and spinners too. Before we go into the techniques, let us take a look at the idea of fishing with scent in general.
The general idea when using scent is to keep your lure or bait within the scent trail. Lures are targeted at fishes that attack and not so much fishes that scour the bottom of the lakes, ponds, etc. for food. Hence, the idea of using scent in this case is to attract fishes to the scent trail. And if one keeps casting on said scent trail, fishes that come to investigate the trail may hang on long enough to get attracted to your lure.