+1 on the heat.
If you don't have it in the correct temp window, it washes off within 2-3 washes.
I am on the post about it
As a coating and what it can do, I love it! I have never had something that was so easy to go on, looks great, and lasts a crazy long time. Plus it beads and makes winter washing a breeze.
The part I dont like with it generalizes all semi-permanent and permanent sealants into one category. You dont need to wax or use a paint sealant with it. I dont like products like this because I have a large assortment of waxes and sealants, and I switch it up every 6 weeks or so.
So all in all, its a great product, very easy to sell, but I like switching through waxes. I might take Exo off in the spring and go back to my waxes