I don't want to stick a needle in anyone's eye but the tape thingy, duct or heat shrink or electrical is going to potentially cause your carts to wear prematurely, especially if you don't peel the original label first.
The carto acts has a heat sink for the electrode/wick. If you in any way seal any more of that heat in you may not get the greatest results. At ome point you would find it more difficult to determine if the carto is getting too warm resulting in burn-out.
Sorry for the logic

The carto acts has a heat sink for the electrode/wick. If you in any way seal any more of that heat in you may not get the greatest results. At ome point you would find it more difficult to determine if the carto is getting too warm resulting in burn-out.
Sorry for the logic