as a tarmac kiss expert, two things
as others have said, stick a plasticy thing over it, any chemist should stock them, stops it hurting, keeps it clean, stops it scabbing and scarring, no brainer
the two dry cleaners near my house have done excellent repairs on three different tears to lycra, a knee, hip and elblow, almost invisible and holding perfectly a year later for the hip to my assos shorts that I use plenty
tyres, even gators don't slip without reason, gots to be oil or gravel or something, wet metal?