Full Text Query

[Its due when]

Hi guys, I have (hopefully) a simple query regrading full-text indexing. If I start a full population and for whatever reason "stop the population build", can I then just start a full population again? Im not sure if any indexes get blown out of whack or whether I need to recreate the catalog by dropping it and recreating it. Hope to get some advice on this. Thanks in advance! Nic