How does shoe goo work on the grip of a skate shoe?

I just got through another pair of skate shoes that are supposed to last for a really long time so I got some lakai's and shoe goo. If I put shoe goo on the suede, will it be less grippy? How well does shoe goo grip? Right now the shoes have killer grip. And should I wait til it's about to tear to put shoe goo on? Or put it on now... Or when it's completely torn? Hopefully I won't need it for a while. Thanks