For what its worth if one chooses to use lead there is an easy alternative source which is automobile tire weights and usually can be had for the asking. The advantage over the commercial stick ons is the chunks can be hammered on a vice or anvil in seconds to a paper thin consistancy then if you want to trim weight its easy to just use scissors.

In this condition the lead can be wrapped around stabilizer struts and a bit of thin CA bingo it disappears or moulded, shaped or applied just about anywhere such as a cheek cowl, here is a photo of a 50 cal musket ball shaped in this way.