Astro turf Q

[bbq]

We are building a new track with alot of turf!
But it is a bit long straws/hairy? if you can call it that. (cant find the right words in english)
We trimed it with an open flame befor but i was woundering what
you guys over there have done?
Untreated is feels weird to drive on.
I want it to be faster and is there any good ide to add sand or
some sort of dirt to make it more packed/hard?

/Daniel