Hurt you more than help. Goat on a hard track, you will more than likely see some "tearing", or feathering of the rubber . You will overheat the tires, and start to slide, then it will slide more as you go. Same as if you have too soft a tire if you have ever experienced this.
However.....there are exceptions. Hard track, with zero bite, will work with an older durable tire where you may wipe a coat or 2 just before you go out.
Dry slick, if truly dry slick, goat wont make speed, may slide as mentioned, and in general be slow. Probably once again will see the "tearing", or feathering depending on which brand of tire.
This is just some good quick easy info for using goat when not needed.
On Hard dry slick track to much aggressive prep the tire will slide causing the driver to feel the need for more bite, thus MOST make the mistake in using MORE of the aggressive prep and find themselves scratching there heads as it's still sliding, in MOST cases with this type track and condition you need more of a medium based prep, now if there is moisture and wet slick even if hard then you can pretty much count on the aggressive prep being the ticket.
Soften the tire quickly and add some bite.
Depending on if you simply wipe as a pre-race wipe, or if you pan roll it, your mileage will most certainly vary.
On cold nights, you'll see some guys burning goat in with a torch or heat gun right before going to the grid.
I would agree with the other responses though, that goat is not your typical "go to" prep when on a dry slick track.
Building layers of bite during the week preceding, and being on the right internal will make all the difference.