Slicks can only be used on certain tracks if you have a cage, due to the higher chances of the car rolling if you get into a slide.
The extra force your able to turn in on the slicks can cause oil surge from the grip, chances are low, but it's just one worth considering, and making sure your oil is up on the marker even more so.
If you buy second hand slicks, they can go off very quickly and they'll be utter rubbish on track, they turn into a hard plastic type material instead, they have to be used within a certain time.
If your unsure how long they've been sitting, demon tweeks sell spray to soften the tyres up again